vaughny in da house 
looks a nice van guy,
couple of quick questions to ask before viewing
what welding has been done on the van
when was the respray done
what work has been done on the engine, is it original or re-con
has he got receipts for the work that has been done to the van, i.e respray, welding etc
if all is good and it`s a genuine van and genuinely had loads spent on it
£6k all day long
one thing i will say is check what size the bed is as most people prefer one that goes the full width of the van, some only go across 3/4 of the width due to cupboards and if there is two of you it can get pretty cramped 
any thing else you need to know ask away
one of my old bays

dudes!
thanks for all the replies
this is the first time I have looked at a van and I don't know much about them but you are all a massive help

don't know about the welding
the engine looked original but very well maintained (wish I'd taken a photo of it now)
from memory it was a shell rust treatment but I don't know when... the rust spots are from obvious damage... only small and on the corner of a door where it has obv got banged - it certainly didn't look, from a brief inspection, as though it was a shoddy job and full of filler.
he does have receipts but I was looking at it on the side of a road and speaking to him on the phone so it wasn't that easy
as it was only a 2 berth the owner imported a 4 berth so that he could have more room - the seller, on the phone, seemed like a really genuine chap and was happy to talk about anything to do with it
here's the thing... he's asking £7.7k for it which to me, even for this, was a bit high
I think I am deciding not to pursue this one too much further unless everyone thinks I am being a fool
my reasoning behind this is
it ain't tax exempt (ideally I would want pre-72 as this will be a luxury)
fuel economy on this one will be about 22mpg (or thereabouts I am guessing?)
I don't mind buying a cheap(er) knackered one that I can restore in the way I want it (sympathetically) and in the colour I want... and then I will know that I haven't spent £7k on polyfilla!
ps. that's a lovely looking van you have there vaughn