Maggie's Farm

While technically not "British" Colfer writes in the grand tradition of UK fantasy and I really enjoy his books. If you appreciate dry wit, writers like Simon Green ("Nightside" series), Terry Pratchett ("Discworld" series) are also worthy of consideration. Neil Giaman is another worthy author although I believe that he's much too impressed with his skills as a yarn spinner as he can get a little obtuse and weighty at times. That being said, but frankly, Gaiman's "American Gods" is a brilliant work as is "Good Omens" which he wrote with Terry Pratchett.

For the Marines, there is Mary Gentile's "Grunts" which is, well there's no other way to describe it, unbelievably funny and gross at the same time. It's a book about some Orcs who become enamoured of the US Marine Corps and hilatiry ensues.

I really like British fantasy and scifi. :>)