Gents, thanks for your replies. The book is for my brother-in-law as a birthday present and a general book is required, nothing specific.
I have found 3 on Ebay:-Lancaster Story DVD & book 2010.
LEO McKINSTRY Lancaster The Second World Wars Greatest Bomber and The Complete Illustrated Encyclopedia of the Lancaster Bomber.

Linds, Lancaster at War ( or Lancaster at War 1) is great to browse, as its about 70% photos, the McKinstry book is more of an in depth read, with a few photos.