In reply to JimboWizbo:
The BMC have a book called
British And Irish Climbing Guidebooks 1894 to 2011 A Collectors Guide
which is the book you're looking for. It's all guidebooks, not just the BMC ones and it has interesting notes about the books as well as colour photos of all the front covers.
I got mine from a BMC stall at Cliffhanger and it was either thrown in for free with another purchase or I paid about £3 for it. Can't remember which, but I remember getting it for next to nothing.
Basically if you enjoy collecting guidebooks is more of a necessity than a luxury