Here are some resources to find where some foraging can be done (thanks Michelle!)
Fruit Trees in Cambridge
One main tip is not to collect items on busy roads. Not only for your safety but because the fruits will have been exposed to a lot of pollution. Also don't pick things lower than your knee in case of dogs peeing on them!
Here are some good tips from the Woodlands Trust.
If you are unsure what you are picking or want to know more about what to forge, Google foraging classes. There are some at Brandon Country Park and there are others in the local area.
Best of al its free!
All the Best!
American to Britain