A lot of vans were flood damaged in 2007. It was made clear at the time that none of them would be sold on and put back on the road.
If yours could be one of these, contact either VOSA or DVLA and ask them to check on your vehicle. If this is the case, then you should have an easier time getting your money back.
Possibly your
Insurance company may be able to get some info on the history of the vehicle. If not, try an HPI check on it. Brownfools should automatically do it on any part exchange vehicle they take in.
Do you know a friendly policeman ? There is a lot of info on their computer system. It could be a ringer.
I bought my last van from Brownhills. The van was nearly new so there were no real issues with it. When I came to get my first service and habitation check they were a bit vague about the cost beforehand. When I went to pick it up and pay the bill, I got a big shock at the price. £550 for the work. They never got any more money off me after that.
I sincerely hope you get this sorted quickly and to your satisfaction.