definatly walk away from ones that arnt perfect for you and the price
also check the chassis for lots of light flaking/ rust and water use, ie pulling boats and stuff, although i live in a costal area so saw some like that
and generally the interior is a good sign how a cars been looked after,or not
raise it right up and check the air bags, do they look new/replaced, or old and very brittle and dry and cracking
ive read some good posts on here with regards to reliability with them, mines been rock solid so far but has been looked after, and i dont do mega miles or abuse it, although as winter really kicks in it will be used a lot more, but its a superb car to own, looks,feels,is, more nicer to own than any jap thing, its british luxury and you feel that class when driving it, sure there are a lot of them about that have not been properly maintained and looked after, which have problems, and on the internet/forums people maintly tend to speak out about problems and slate them, afterall whos going to search out and join an internet forum just to say "hi ive got a p38 thats nice and neveer let me down" ?...no one, and affluent range rover owners are generaly not the sort of people to kick about on internet forums anyway , so there are a lot of good ones out there , ive read posts on here of people who have bought them and had them 2 years and never gone badly wrong or anything other than general maintenence/wear and replacing things like brakes etc, same as any other car