I love Pat Barker's books. Union Street was her first novel, and she gets better. Try "The Ghost Road", which is, I think part of a trilogy - can't remember the other two titles, but Amazon should be able to help.
You would have to read the first 2 in the trilogy first - Regeneration and I think the other is called Eye in the door?
Last Orders is an excellent read!!!
I have to say that the Regeneration Trilogy is brilliant - I always thought it was far better than Sebastian Faulks' "Birdsong" but I may be in a minority!