Never having been to the UK, I don't have a brilliant understanding of where everything is in Britain, though it grows as I do more and more research into my British ancestors. Plus, sometimes locations given in censuses and the like don't appear on Google Maps, which can be very frustrating.
One website which I have found incredibly useful is A Vision of Britain Through Time. Covering 1801-2011, it has maps, historical descriptions, census reports, etc for lots of little places across Britain. Although the website can be quite general in the information given, I've found it terribly helpful to get an idea of where places are/were and what they might have been like.