Bulmershe is miles away from campus. Well not miles, but put it this way: there's a bus.
My friend lives in St Georges and he doesn't find the walk so bad. Sherfield is pretty close to Georges, I don't think it makes a lot of difference. There are 2 Sainsburys in town (prolly a bit of a trek with bags mind), but theres ASDA and Tesco too. I've seen tonnes of Tesco vans, so tbh I'd say make friends and get everything delivered together!