Ebay watching is your best bet IMO, or car boot sales. I got my old Raleigh off of ebay for 12 quid, and a Brooks Sprinter saddle for it at a car boot for a tenner.
Retrobike is another good website, although harder to find a bargain than on ebay
maybe i'll ryanair over to stansted and look for a bargain :D
maybe i'll ryanair over to stansted and look for a bargain :D