We are going to Cambridge for about a month and want to get a Rick Steve's book. However there are three of them: England 2013, London 2014 and Great Britain 2013. If we are mainly going to be around London, which book is the best to get? I take it there is a lot of overlap. Many thanks for the advice.
If you are willing to expand your choices I would suggest The Rough Guide To England would be a better purchase.
You are correct. There is a lot of overlap but the London book will give you more information about London and I suspect it includes Cambridge as a day trip. If you are going to restrict yourself to the London area, that would be the best book for you. You are within relatively short drives or train trips to many excellent areas. You could easily see much more of the UK than just the London area. Decide how much travel time you have and think about your priorities. In the grand scheme of things you might find you have a use for the Great Britain book. They aren't that expensive.