ts a very, very good price, just look how much they are to buy off auto trader etc.
wouldnt an 04 be one of the multijets too??
ususal problems with any used car, make sure all the warning lights go out, make sure it pulls well to, no hestations etc, no excessive smoke, youll get some, its a diesel
drop links are prone to go on the 156, youll here a slight knocking on the front going over bumps, rear knocking will more than likly be the bushes.
then just check everything as normal, sure there will be some more ideas thrown around when more people are on here
it sould be a facelift too, so its at least a grand and a half under price, unless its a late registered pre face lift