I eat a tea spoon of local honey (which for me is Solihull) every morning, and that seems to help quite a bit. Used to get it really badly, getting worse as I got older but I tried the honey thing last year and this year and have seen a big improvement. Plus it tastes pretty nice too!
Do bees take pollen from trees as well as flowers? If not, then it might not work for people allergic to tree pollen.