The basic problem with nthism premise is that the honey may be local but the pollen that causes the hay fever symptoms may be coming from far away places borne by the wind. In the US you can purchase honey from bees that visit a particular type of flower (maybe because of its abundance around the hives) and sold as such. again dont know how effective iot is. I have found that my hayfever symptoms are delayed well into the season by taking garlic tablets daily. You can also get pollen injections under the skin to build reisitance to the pollen.