It's amazing how few home brew shops there are considering the resurgence in real ale and micro breweries popping up all over the place. I live in London where you can buy almost anything and still I can find only one HBS (fortunately it's 20 min bike ride from me in Brixton) and there core business isn't really selling to home brewers, it's doing Beer making workshops with selling ingredients to home brew like me on the side.
goodolepete, the only thing I can suggest it so contact a couple of local micro breweries and see if they will sell you ingredients. Even if they'll just sell you Marris Otter/Pale malt that's the bulk of your ingredients for AG. Hops can keep for a couple of years in the freezer so just bulk buy to save on postage. If you are a kit brewer I'd just go to Wilko of Tesco clik&collect