Wish I knew! He's got my f**king car!!!
He was on here on 26-08-2014 at 19:09 according to his profile.
Yeah have a spare key etc, but that's hoping the car is outside. Good idea about the roller but if he's on here regularly then will probably know and not show! Never been (and never want to be again) in this situation before so no idea what the next steps would be.
If you cant get hold of him via phone/email/facebook/pm etc.
Take the day off, go to his workshop.
Talk to him. Find out what the problem is.
Take the car away.