Ergh, I get worked up when I read things like this. Just so many stories from so many different places. Its becomming too common.
Interestingly, I dropped my little old BMW to my normal specialised BMW place today and noticed that there were lots of non-BMW's there today which was totally unusual as it is an almost strictly BMW shop. Went inside and found out that the old owner had sold up in October. I've had so many bad experiences even with my run-of-the-mill E90 that I was actually worried about leaving it with them. I know, the car isn't anything special, but having been burned so many times I still stress about it. As soon as a car has quirks (GTR's or even old BMW's) you need to make sure the right people look at them.
I hope you dont get ripped off man. They better sort this without causing more dramas.
BTW, your R32 is stunning.