Got my '03 V8 Vogue on LPG for around that price....great car but as with all s/h purchases, you pays yer money - you takes yer chance....
As per Hippo, save a bit more and get a post 2006 TDV8....
Don't get me wrong there are good ones but there are more bad ones out there (like the P38's) so if you go for one, look at loads and test everything - don't go for a quick drive - I took mine out for nearly 2 hours, luckily I was alone so I could find alsorts of different road types to test it on and then a quiet road and parked - bonnet up, boot floor up, Crawled under it, over it, pushed everything, pulled everything, pressed everything....acoustic cover off, oil filter out, air filter out, levels checked....All nocks and crannys checked.....
They are a complex beastie so choose wisely....