Volunteers volunteer roles in bourne, lincolnshire

We’re looking for a Volunteer to become our Graphic Designer who can turn ideas into impact—someone who can craft visuals that radiate warmth, hope, and community spirit.

SUNSHINE, a brand new 100% volunteer-run loneliness charity, providing services to those living with loneliness and social isolation and we're seeking a Graphic Designer who is a creative visionary to help us tell our story in ways that stop the scroll, spark emotion, and build a buzz.

What You’ll Help Us Create

• Social media posts that inspire action and connection.

• Information graphics that make our mission clear and compelling.

• Motion graphics that bring our story to life.

• Posters, roller banners, and flyers to raise our profile in the community.

• Business stationery and training booklets that reflect our values and professionalism.

You’ll be working closely with our passionate team to shape the visual identity of SUNSHINE—from launch materials to ongoing campaigns. Your designs will help us recruit volunteers, engage supporters, and build a movement that challenges stigma and celebrates human connection.

Ready to make a lasting impact and help us shine?

JOIN OUR TEAM

Be The SUNSHINE In Peoples Lives

Who are we?

We are Buttons & Bubbles CIC. We work to increase inclusion and representation across society for disabled families.We have several different services including inclusive characters, sensory workshops, resources, events, advocacy and more.

What are we looking for?

Are you looking for a volunteering opportunity that you can do in your own time and without having to leave the comfort of the sofa? Do you have a good imagination? Are you interested in graphic design? Or have an artistic flair?

We’ve created ‘Bubble World’ which is home to our characters. We have had some graphics made for ‘Bubble World’ but we would love more! We can then use them and others such as little Santa Hats, Pumpkins and Easter Eggs to keep creating our resources and activity packs.

What do we expect?

• Be willing to undertake our training programme which will be done virtually and at a time to suit you.

• Have an Enhanced DBS check (preferably be on the update system)

• Sign our volunteer contract. (If you disagree with anything in it please do discuss it with us and we will be happy to have a conversation and make small changes if appropriate).

• A positive attitude to disability and illness. We are happy to answer questions on this.

What can you expect?

• A community group that does not currently operate a rota system of any kind. Youdon’t have to regularly commit your time.

• A kind, caring, nurturing company who cares about people, staff and volunteers. Our aim is to keep your wellbeing at the centre of our work.

• A very positive and proactive approach to disability and illness. Any and all accommodations will be made that you require. If there is anything you wish to discuss in private please email us and we will arrange a confidential chat.

Benefits to Volunteering with Buttons & Bubbles CIC

• Gaining valuable experience and improving your confidence

• Allows you to explore potentially different areas of interest.

• Make a difference to community

• Develop your current skill set and gain new skills.

• Displays your level of commitment to future employers.

• Displays your ability to balance and schedule your time effectively when seeking future employment.

For further information or to apply email us and we will be more than happy to have a chat. 

Please note we are looking for volunteers who are based in the UK. 

We're STAMMA. We exist to create a world that makes space for stammering. Where a stammer is embraced as just a difference. Where no-one judges us on our stammer or the way we choose to deal with it. 

We will stand up for and empower those who stammer and challenge discrimination wherever we find it. We will provide support and information and fight for speech and language therapy services for those who want it. No matter how you talk, we're here for you. Join us and help the public understand that stammering is not a sign of being shy, drunk, dishonest, nervous or weak. It's simply how some of us talk.

We provide a free national helpline, email and webchat service, online resources and information, support for local groups and professional networks, for families with children who stammer, and an Advocacy Service for those who have been discriminated against because of their stammer.

STAMMA’s Helpline Services include our phoneline, webchat and email support services and are a hugely important part of STAMMA’s work. This is frontline stuff, responding to people reaching out for information and support. It’s a great opportunity to spend time chatting with people who stammer, as well as their parents, grandparents, teachers and employers, taking the time to make space to listen and to value what they have to say. Where appropriate we then signpost people to useful information, support and services.

We use a virtual call centre which means you can take calls and webchats from home, using a desktop or laptop computer.

Our helpline is manned by our amazing volunteers from 10am - 2pm (our morning shift), and from 4pm - 8pm (our evening shift), Monday to Thursday. We are looking for dedicated volunteers who can commit to one of the following shifts on a weekly basis:

Monday: morning or evening

Tuesday: morning or evening

Wednesday: morning

Thursday: morning

We think that you (and our callers!) will get the most out of this opportunity if you're able to volunteer with us for at least 12 months or more. By gradually learning and developing your confidence in the role, you can have the biggest impact. 

About the role

Working within our Helpline Services, we’re hoping you’ll feel comfortable to:

• Take helpline calls (listening and speaking on the phone)
• Respond to webchats (reading on-screen messages and typing responses)
• Sending occasional emails

If you wish to, you can also be linked to an area of project work. That way, if the helpline services are quiet during your shift, you can get involved in other areas of STAMMA’s work. Project work is likely to involve reading and reviewing documents and resources, contributing to discussions and campaign ideas, and helping develop new resources.

We provide structured, online training that you can complete at your own pace, but is likely to take about 8-10 hours in total to complete. Following the training, you’ll have practice helpline calls and webchats. If you feel ready after that, you’ll start working in the helpline services. Ongoing support includes:

• Monthly helpline services meetings where you can meet other helpline volunteers. These monthly meetings include a short training session and discussion where we share and learn from our experiences of different calls and webchats.
• We have a WhatsApp group where you can keep in touch with other volunteers.
• Volunteer supervisors are available for one-to-one support and discussions.
• Access the training modules as many times as you want.

Who are we looking for?

You’re likely to enjoy volunteering in the Helpline Services if you:

• have a genuine curiosity about people and their experiences
• are able to understand written and spoken English
• are comfortable enough to speak on the telephone
• are comfortable with basic email functions
• have good administration skills
• enjoy listening and talking to people

It’s not essential to stammer yourself if you’re interested in working in our helpline, but it can be an advantage if you do, or if you are the parent of a child who stammers. Many of our callers find it really helpful to know that they’re speaking to someone who really ‘gets it’ and who has that personal insight into some of the issues and questions they have.

This is a volunteer role is remote, so you will need access to:

• a quiet place where you can work in privacy and not be overheard during calls
• a mobile phone or landline
• a computer or laptop

What can you gain from this opportunity?

This is a wonderful opportunity to join a small and friendly team! We'll make sure you're supported in every step of your journey, and you'll get to meet some inspiring people. You'll gain skills that you'll be able to use in all areas of your life and build experiences for your CV. Most importantly, you will make a real difference in the lives of people who stammer.

How to apply

To apply, please fill in our volunteer form that is linked to this opportunity. 

We are dedicated to making sure our roles are accessible and open to all. If you have any questions, please don't hesitate to reach out to us,

Chatterbox Befrienders offer one-to-one telephone support and will call a client once a week offering companionship and a listening ear for an individual who might otherwise go unheard. Chatterbox volunteers befriend a variety of people including carers, socially isolated individuals who are struggling with loneliness, people with ill health and those that 
have been bereaved. 

THIS ROLE COULD BE FOR YOU IF:

- Would like to make a real difference in someone’s life

- Want to challenge loneliness and can commit to a weekly phone call

- Are a good listener

- Are empathetic, patient and of a caring nature

- Have good verbal and inter-personal communication skills

- Recognise the importance of confidentiality and can uphold this in practice

- Are committed to inclusion and treating people with dignity and respect

REQUIREMENTS OF A BEFRIENDER INCLUDE:

- Calling your client once a week for a chat of up to 45 minutes; this is a 26 week initial commitment, at the end of which each client’s needs are reviewed

- Completing an online call log record promptly after each phone call

- Ensuring immediate contact with the Chatterbox Coordinators if you feel that the client might be a risk to themselves or others

- Liaising with the Chatterbox Coordinator on a regular basis regarding the service, as well as discussing personal learning and development needs

- Respecting service standards, appropriate boundaries and recognising the range of policies and procedures that impact on befriending vulnerable adults

BENEFITS OF THE ROLE MAY INCLUDE:

- Knowing you are making a difference to someone’s life

- Joining the Omega Team who are taking action against loneliness and isolation

- An opportunity to enhance your CV or learn new skills

- An opportunity to engage with your community

SUPPORT AND TRAINING PROVIDED:

- Omega Chatterbox induction program

- Safeguarding training

- Ongoing support from Chatterbox Coordinators for all questions, concerns, and support

- Out of pocket expenses are reimbursed and a mobile phone can be provided if appropriate

- Monthly Befriender group support meetings via the Zoom app

LOCATION OF THE ROLE:

- Home-based

WHEN ARE YOU NEEDED:

- Provided on enquiry

A Disclosure and Barring Service (DBS) check is required for this role. If you have a criminal record this does not automatically prevent you from being considered as an Omega Chatterbox Befriender. We will take into account the nature of the offence, when it happened and whether it is relevant to the voluntary role. If you are shortlisted, this will be discussed with you during the recruitment process.

Alex, The Leukodystrophy Charity (Alex TLC) is a small, independent rare disease charity competing for essential resources within an extremely competitive arena.

Like many other small charities, we have grown organically from an informal support group to the recognised voice for leukodystrophy patients and their families. In order to fulfil our charitable objectives we need to increase and sustain our corporate income levels.

Could you spare a few hours a week to help us?

ABOUT THE ROLE

We are looking for volunteers, preferably with corporate fundraising experience to:

• research the corporate giving landscape and the interests of potential donors

• identify potential corporate donors and partners whose corporate social responsibility (CSR) goals align with our mission and values

• approach local and national businesses in person and over the telephone to inform them of the work of Alex TLC

• keep a record of all approaches

Time Commitment

• This role is flexible and can easily fit round your other commitments. 

Location of Volunteering

• Homebased

ABOUT YOU

• an interest in Alex TLC and the work that we do

• access to a computer/laptop with an internet connection, and a printer

• basic understanding of the complexities of leukodystrophy

• excellent written skills

• excellent organisational and administrative skills

Benefits to you:

• Meeting and working with new people

• The ability to volunteer around your own commitments

• Learning new skills whilst having fun!

• Adding to your CV

• Helping those affected by leukodystrophies

We can only accept applications from UK residents. 

The difference you will make to cats and people

Our social media volunteers use their passion and knowledge of social media to promote the activities of local volunteer teams though various channels. They directly help cats by raising awareness of Cats Protection. A higher profile can help us raise the funds we need for our work, ensure people know they can adopt a cat from us, help promote neutering and help as many people as possible learn more about feline welfare.
 

You can expect us to

• Make you feel welcome, included and respected in line with our values and behaviours
• Support you in having a positive and impactful experience at Cats Protection
• Cover agreed out-of-pocket expenses in line with our Expenses Policy
• Provide you with access to learning, development and engagement opportunities

Would you like to become an Ambassador for knus? We've introduced our new arm-chairing volunteer position.

If you're interested arm-chair volunteering (our most flexible, low commitment role) and applying to volunteer at knus, simply read through the information on this page and apply.

• Are you over 18 and living in the UK? You must be over the 18 years of age and live permanently in the UK.
• Do you have a mobile phone or laptop? You can do this role whether you are, whether it be on a sofa or on a plane.
• How much time can you give? As much as you want to do. We are flexible and like to work around you.
• Do you like to learn? We provide training for all volunteers that join us. You'll have access to our CPD courses to help you advance your knowledge and certificates to add to your CV.

How does it work?

In 2025 we launched our arm chair volunteering initiative to help us spread the word about our service and to give people the opportunity to take part in surveys and projects to help us deliver the best mental health support to the UK public.

We'd like to embrace what you love doing, whether that be sharing on socials, proof reading, surveys, sharing experiences or getting involved in our fabulous projects.

Important information:

In order to volunteer for knus as an ambassador, you will need to complete a brief application form and a ID check. A DBS is not required for this role, however, if you wish to progress to another role you may need a disclosure. We do this to ensure of service remains a safe place to volunteer for all. Please do not worry about this, we will help you as much as we can.

Training is provided by us and our training partners. You will be required to attend this training using online conferencing software such as zoom or teams.

Do you enjoy organising things and making this happen?

Are you able to volunteer a few hours a week?

Yes? We’d love to hear from you.

We’re looking for admin volunteers to help with our daily operations.  We have a variety of ways you can get involved:

• Responding to client requests and enquiries
• Fundrasing and partnership management
• Managing and updating company databases
• Keeping track of partnership enquiries
• Maintaining internal, volunteer, and client records
• Drafting and mailing client correspondence and newsletters
• Organising events, scheduling meetings, and making travel arrangements
• Providing administrative support to other departments or projects as needed
• Performing other duties as agreed in advance

We’ve designed our volunteering programme to be flexible and adaptive to you.  All volunteering is 100% remote and you’re supported fully by our team.  You control what you do and how many hours per week you want to volunteer.  Some roles may require an Enhanced DBS check. If your application is successful, we will ask for a donation towards the cost of your enhanced DBS check if it's required for your role. This cost is £20.60.

Here’s some further information on what’s needed:

Are you over 18 and living in the UK?

You must be over the 18 years of age and live permanently in the UK.  You must be a UK resident to apply for this role.

Do you have a laptop?

A laptop and a quiet space to volunteer is essential.

How much time can you give?

A minimum of 2 hours per week is required. We are flexible and like to work around you.

Training

We provide CPD accredited training with 3 short courses needing to be completed prior starting your volunteer role.  After, you’ll have access to over 90 CPD accredited courses should you want to study further.

About us: GT Scholars is a charitable social enterprise that tackles educational inequality by giving ambitious young people the support, skills and strategies they need to achieve aspirations. We run a wide range of programmes that help young people achieve their academic and career aspirations, particularly those from less-privileged backgrounds. 

What makes us different? We run tutoring, mentoring & career insight programmes that help our scholars, aged 11-18, discover their strengths, develop their mindsets and design their own futures.

There are many charitable organisations and social enterprises offering programmes to improve the life chances of young people. 

However, our programmes use a unique 3:1 model which means that we’re able to sustainably use our profits to provide additional places on our programmes, to young people from low income homes. 

We believe that all young people are gifted and talented, regardless of their background. 

Our mission is to empower and develop the next generation of leaders and change-makers and we’re looking for volunteer tutors that are passionate about making a difference in young people’s lives!

If you are an undergraduate or graduate, you could make a difference by joining us as a volunteer tutor. As a volunteer tutor, you’ll need to:

• Have a passion for helping children and young people

• Provide online one-to-one tutoring support for 1 hour week

• Build pupil confidence in English.

• Have strong subject knowledge (confident enough to tutor up to GCSE)

• Work collaboratively with other tutors and mentors

• Have a minimum of an undergraduate degree or be working towards this

Volunteer tutoring can be extremely rewarding and volunteers with GT Scholars benefit from:

• A flexible schedule - you can choose online tutoring hours to suit your schedule

• The chance to grow your contacts and meet like-minded volunteers 

• The chance to make a real difference in the life of a young person.

Additional information: We’re looking for tutors that can commit to a minimum of 2 academic terms of volunteering.

We will need to conduct reference checks and you will need an Enhanced DBS for this role as you will be working directly with children. We can process this for you or you may submit one if this is less than 3 years old.

About us: GT Scholars is a charitable social enterprise that tackles educational inequality by giving ambitious young people the support, skills and strategies they need to achieve aspirations. We run a wide range of programmes that help young people achieve their academic and career aspirations, particularly those from less-privileged backgrounds. 

What makes us different? We run tutoring, mentoring & career insight programmes that help our scholars, aged 11-18, discover their strengths, develop their mindsets and design their own futures.

There are many charitable organisations and social enterprises offering programmes to improve the life chances of young people. 

However, our programmes use a unique 3:1 model which means that we’re able to sustainably use our profits to provide additional places on our programmes, to young people from low income homes. 

We believe that all young people are gifted and talented, regardless of their background. 

Our mission is to empower and develop the next generation of leaders and change-makers and we’re looking for volunteer tutors that are passionate about making a difference in young people’s lives!

If you are an undergraduate or graduate, you could make a difference by joining us as a volunteer tutor. As a volunteer tutor, you’ll need to:

• Have a passion for helping children and young people

• Provide online one-to-one tutoring support for 1 hour week

• Build pupil confidence in English.

• Have strong subject knowledge (confident enough to tutor up to GCSE)

• Work collaboratively with other tutors and mentors

• Have a minimum of an undergraduate degree or be working towards this

Volunteer tutoring can be extremely rewarding and volunteers with GT Scholars benefit from:

• A flexible schedule - you can choose online tutoring hours to suit your schedule

• The chance to grow your contacts and meet like-minded volunteers 

• The chance to make a real difference in the life of a young person.

Additional information: We’re looking for tutors that can commit to a minimum of 2 academic terms of volunteering.

We will need to conduct reference checks and you will need an Enhanced DBS for this role as you will be working directly with children. We can process this for you or you may submit one if this is less than 3 years old.

The role in a nutshell:

Volunteers help to keep Age UK charity shops running like clockwork and are an essential part of everything that we do. Our charity shops raise vital funds that support the wide range of services Age UK delivers, so if you have some free time available and would like to help, we’d love to hear from you! Whether you are looking to gain new skills and experiences, use those you already have or are just looking for a way to get out and meet new people, then we have flexible options to suit you!

What will you be doing?

Volunteer Shop Assistants carry out a wide range of tasks in their roles. You might be sorting and pricing stock, engaging with customers, ringing items through the till, keeping our shop floor full and organised or supporting with raffle ticket sales and promoting gift aid.

How would you be supported in this role?

When you begin your role, you will receive a mix of e-learning and in-person training to get you started. Throughout the role, you will receive refresher training as required as well as ongoing support, reimbursement for role-related expenses and the opportunity to further shape the volunteering you do.

Why do we need volunteers in this role?

Age UK operates charity shops to raise funds for the delivery of services for older people in need. Volunteers play a key role in the shop team, ensuring our shops are welcoming places in the community and selling the items that are generously donated to our organisation.

Additional information:

We offer a variety of flexible shifts for volunteers.

What skills, interests or experience might be helpful in this role?

We welcome applications from people with a wide range of skills and experiences. You don’t need any retail or shop experience as full training will be provided. What’s important to us is that you are a team player, open to learning, will follow Age UKs policies and be an excellent representative for the charity. We know that our shop teams are stronger when they are inclusive and representative of their communities, so we will do what we can to find a role which works for you.

 

 

 

About Us 

Suicide Awareness Prevention UK (SAPUK) is a dedicated, non-profit Community Interest Company (CIC), established in 2016, focused on providing support to individuals dealing with suicidal thoughts and tendencies. Our goal is to guide people from distress toward hope, helping them regain the strength to live their lives to the fullest.

Overview
 We are seeking a passionate and dedicated Fundraising Volunteer to join our team. The ideal candidate will play a vital role in developing and implementing fundraising strategies to support our mission. This position requires excellent communication skills, a strong ability to build relationships, and a commitment to achieving fundraising goals. The Fundraiser will engage with various stakeholders, including donors, volunteers, and community members, to promote our cause and secure financial support.

Duties

• Develop and execute fundraising campaigns that align with the organisation's objectives.
• Cultivate and maintain relationships with current and prospective donors through effective communication and engagement strategies.
• Utilise software tools such as Raiser's Edge for tracking donations, managing donor information, and reporting on fundraising activities.
• Collaborate with the marketing team to create promotional materials that highlight fundraising initiatives.
• Organise fundraising events, including planning logistics, coordinating volunteers, and ensuring successful execution.
• Conduct outreach efforts to engage the community and raise awareness about the organisation's mission.
• Provide exceptional customer service to donors and stakeholders, addressing inquiries and fostering positive relationships.
• Monitor market trends in fundraising to identify new opportunities for growth and engagement.

Qualifications

• Proven experience in fundraising or a related field is preferred.
• Strong skills in relationship management and public relations.
• Proficiency in using software tools such as Raiser's Edge or similar fundraising platforms.
• Excellent verbal and written communication skills with an ability to engage diverse audiences.
• Demonstrated ability to work collaboratively within a team environment while also being self-motivated.
• Strong organisational skills with attention to detail in managing multiple projects simultaneously.
• A passion for the organisation's mission and a commitment to making a positive impact in the community.

Job Type: Part-time

Pay: Up to £1.00 per year

Expected hours: No less than 2 per week

Benefits:

• Work from home

Experience:

• Fundraising: 1 year (preferred)

Work Location: Remote

This role is advertised as part of TPP's Free Giving Back Services. This volunteer advertisement copy has been supplied to TPP and applicants apply direct to the organisation. Please contact the organisation directly if you have any questions about this volunteer role.

Volunteering for Sense

Sense is a leading disability charity with extensive knowledge and expertise in delivering personalised, creative and flexible support for disabled people with complex needs. Our tailored approach ensures that every person is empowered to live fully at every stage of life.

Due to the nature of the role, we require all applicants to be aged 16 or over. You must have a UK address to volunteer with Sense.

What your role will involve

You’ll get the opportunity to get involved in a wide range of activities, including:

• Welcoming and assisting customers, providing great customer service, helping create a wonderful shopping experience.
• Receiving donated items from the public, thanking them for their support.
• Sorting, steaming and preparing donations for sale.
• Helping to display stock in eye-catching and exciting ways.
• Keeping the shop floor clean, safe and tidy.
• Talking to customers about Sense and the work we do. 

When you’re ready, we’ll provide you with additional training to:

• Serve customers on the till in a warm and friendly way.
• Put sales through the till, packing them and thanking the customer for shopping with us.
• Talk to customers about Gift Aid and other fundraising initiatives.

If you’re interested in taking on additional responsibilities, you can train to become a Key Volunteer, helping the shop manager by:

• Helping supervise the shop and other volunteers.
• Supporting the shop manager to make sure customers have a great experience.
• Opening and closing the shop when needed.
• Cashing up at the end of the day. 

Will the role suit me? Yes, if you are:

• Passionate about Sense’s work to support disabled people with complex needs.
• Calm, kind and have a friendly personality.
• A team player who enjoys working with others.
• Enthusiastic, motivated and someone with a positive attitude.
• Respectful of others. 

What can Sense offer me as a volunteer?

• Full training with ongoing support and guidance from your team.
• A chance to meet new people.
• A great way to develop new skills and share your existing skills.
• The feeling you get knowing you’re making a difference to the lives of disabled people with complex needs.
• A reference to support future applications for paid or voluntary roles.
• Support from our Mental Health First Aiders, should you need it. 

About Sense

For everyone living with complex disabilities. For everyone who is deafblind. Sense is here to offer personalised support to help people communicate and experience the world. We believe that no one, no matter how complex their disabilities, should be isolated, left out, or unable to fulfil their potential. Our experts offer support that’s tailored to the individual needs of each person, whether that’s at our centres, through our holidays and short breaks, or in people’s own homes. In addition to practical support, we also provide information to families, and campaign for the rights of people with complex disabilities to take part in life.

Volunteers add real value to Sense, bringing their passion, enthusiasm and fresh perspectives to the work that we do. We believe that volunteers enable us to bring people together, and provide opportunities for people with complex disabilities to communicate and experience the world.

We include. We collaborate. We find a way. We challenge. We celebrate.

*APPLICATIONS CURRENTLY OPEN FOR MALE IDENTIFYING VOLUNTEERS ONLY*

Men Who Talk is a UK registered charity, running twice weekly online peer-to-peer support groups for men aged 18+ across the UK. The groups take place between 7:00pm - 8:30pm every Wednesday evening, and 14:00 - 15:30 every Saturday afternoon. 

Our groups are supportive spaces for men aged 18+ to come and talk openly about what's on their mind. All groups are free to attend and follow the evidence based model of peer support. 

Volunteers are required to be online from 6:45pm to 8:45pm on a Wednesday evening, and from 13:45 - 15:45 on a Saturday, and are required to facilitate around 1 group per month. Volunteers are asked to commit to an a minimum of 6 months of volunteering in the initial stage. 

All groups are facilitated by a minimum of 2 facilitators, and follow a semi-structured pattern.

We are looking for passionate men with some experience of groups facilitating or working in mental health settings to come join us as facilitators. Experience in using online platforms such as zoom is essential. 

A degree in psychology is preferred but not an essential requirement.

You must have the right to live and work in the UK in order to join us, MWT is unable to sponsor any visa applications. Fluency in conversational English and a firm grasp of technology is also required. 

Why Join MWT? 

Men Who Talk is an exciting, fast growing charity, creating new spaces for men to talk openly about what's on their mind. 

We have a diverse team full of talented and passionate individuals who are committed to changing the face of mens mental health across the UK. 

As well as the opportunity to join the organisation at an exciting stage of it's development, volunteers also have the opportunity to develop their own skills and have regular chances to feed into the creative and strategic development of the organisation. We also provide enhanced safeguarding adults training, and the opportunity to develop key skills to enhance a career in mental health. In addition to training opportunities, MWT also provides weekly online group supervision with a specialist supervisior, free of charge for all volunteers. 

PLEASE NOTE: We are only able to accept applications from individuals who already have the right to live and work in the UK.