i bought the first one i looked at, but was very thorough
go in old clothes and dont be afraid of crawling round under the car, take a torch
the one i found came with full history and the bodywoork is all original and in fantastic condition, was lucky i spose, but i did pay top money for my 4x4 at 6.5k
dont be afraid to walk away if you are suspicious or unhappy, i know people who looked at 12 or 13 before they found what they were looking for
usually a case of a car being advertised as mint, and it not being
use the people on here, mine was owned previously by a PF member, so had a chat with him and other people that knew him and it seemed good enough, so went to see it, and was happy so bought it.
hope this helps
a good guide for buying can be found on
http://bbs.rsownersclub.co.uk