Have just finished reading SS-GB by Len Deighton and I must say it was really an enjoyable read detailing a murder investigation in German occupied Britain during the second world war, most people have probably read this book or heard about it at some stage, it doesn't say much about the invasion itself but there is ongoing fighting in the north and resistance elsewhere but German law prevails with British residents still in their positions especially in the police and a murder investigation sets the ball rolling in a quite intriguing plot involving the SS versus the German army, traitors, resistance, scientists, exhumation of Karl Marx, the king of England, Americans etc........ A more detailed and revealing summary can be found here http://en.wikipedia.org/wiki/SS-GB but the book is better even than Fatherland by Robert Harris.
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Good book, well worth a read.
Currently reading this which is supposed to detail actual accounts of the botched invasion of Great Britain, defences put in place etc........
Currently reading this aswell and watching the TV series which is great, I have only quibble which is the amount of nudity (good and bad) in the TV series is not in the book so far!!!!