Laverstoke park farm in Overton, Hampshire takes work exp students, go on their website and then the education section. It's not too far from Surrey - you'd need to BnB it but not the other side of the world. If that's a good location for you I can give you contact details for a dairy farm near there too. Also in Heathrow there's Heathrow Special Needs Farm which has a range of farm animals and is an RDA centre they would be grateful for any volunteersn- I used to go every week from Egham