I think the recession had a lot to do with it. The gardening bit was reasonable but the food show was a fraction of it's former size.
I used to take my mom every year, but we haven't been able to go for the last 6 years! Was hoping if we ever get to go again it would still be good (shock)
We used to go every year but it's really declined. Last time we were out within 2 hours. Note, you can usually buy entry with Tesco vouchers.