How good mates are you ... one of you is losing badly on this deal. It smells. I'm sure we had a thread a while ago where someone bought a car off a friend, after ignoring the advice from motors, and it turned out to be a right lemon.
Conversely, I would not want to take advantage of a friend with a cheap offer and if I don't really need the car, am not going to stump up a fair price for it either.
Are you both in Germany as per your avatar ? Assuming its a UK spec, how much aggro would it be just to get it to the UK and him sell it for cash to WBAC. If its a left footer, is there no equivalent of WBAC in germany ?