We visited a place called Sharnfold farm to pick our own pumpkin this year. link here.
Although is was a flying visit and it was freezing cold we had a good time and go to see some of what they had to offer. Its free entry, farm shop with some amazing looking foods, cafe and butchers, pick your own fruit outside, farm animals and a small play park for the kids.
I think its a perfect place to visit in the spring and summer months and i think we will go back with the kids at that time of year.