I haven't joined this, and I don't know if it's one of those clubs where you have to buy a set number of books a month, but "The Readers Union" look like they have some pretty good deals on in their sale catalogue.
Building Regulations Explained and Illustrated
formatting link
£43.99 Amazon £34.99 Club £11
Building Services, Hall & Greeno (2005 edn)
formatting link
£19.99 club £5
Best of Danny Pruoix's Storage and Shelving
formatting link
$23 play.com £16.99 club £5
David Thiel's Power Tool Maintenance
formatting link
$18.99 club £5
Caveat emptor and all that, but it might help Santa stretch his (her) budget a bit this year.
formatting link
a subsidiary of David & Charles.
Owain