https://wwoof.org.uk/

WorldWide Opportunities on Organic Farms, UK (WWOOF™ UK) is part of a worldwide movement linking visitors with organic farmers and growers to promote cultural and educational experiences based on trust and non-monetary exchange thereby helping to build a sustainable global community. The Aims of WWOOF are to provide individuals from all around the world the opportunity; to experience organic growing and sustainable ways of living, and to lend a helping hand wherever needed; to connect with the earth, with yourself and with other like-minded people; to help the organic movement, which is often more labour intensive because it does not rely on artificial chemicals; to have an enriching experience with nature, land and culture