WELL,
It would seem the suprise visit went down like a lead ballon then. Its a shame it has got to this point, but there is no point leaving the car there now. There's not a cat in hells chance of the car getting finished to a good standard, if finished at all!!!
(you never mentioned if he had done any more since last time you visited?)
I would ring round, find someone with a transporter (give them a breif low down of the events) and go with them to collect the car.
Take a bit of cash with you, (everyone loves a bit of cash, everyone has a price!) agree a settlement figure there and then and take the car away.
So what if you shoot a few hundred quid over the odds. Your sanitys worth that much, right!
Steve I think you need to seek legal advise and get a letter from a lawyer stating you will be collecting the car on x date.... And will pay an amount that you think is fair for the work done....
The money spent seeking legal advice only will add to the stress, use the money to get the car back and getting it one step closer to the end result you planned for in the first place!
Once the car is done we will re-visit this thread, with the head line.............
PLOTTING REVENGE.
Im sure there will be pleanty of suggestions.