LEAF Education is the leading educational charity working with schools to help children and young people understand the connection between farming and their daily lives. LEAF Education creates high quality educational experiences, both inside and outside the classroom, that change perspectives and deepen understanding of the food we eat, the people who produce it and the choices we all make as citizens. https://education.leafuk.org 

Countryside Classroom helps teachers to find resources, places to visit and school support relating to the themes of food, farming and the natural environment. 
http://www.countrysideclassroom.org.uk/