Farms for Schools
aims to ensure that school trips to farms are safe, enjoyable and educationally worthwhile. This is an excellent tool for teachers and is jam-packed with resources: http://www.farmsforschools.org.uk

Avoiding ill health at open farms – this link is especially useful for teachers and playscheme leaders visiting with groups (HSE factsheet) http://www.hse.gov.uk/pubns/ais23.pdf