I am talking my bike to Bahnstormers in Alton. Heard really really good things about these guys (specially from people here in Guersney who go over there to get their bikes serviced).
I live in Guernsey so taking my bike there in June, I get a courtesy bike for the time they take to do the service and very reasonably priced too. Might be worth thinking of, I know its slightly further than you wanted....