That's a pity. Get insurance to sort it, sort the tyre mixture out, and take care out there.
Lots of people don't spin on mixed tyres y'know, it's not instant crash and burn.
+1 to that... i cant see how michelins on the front and bridgestones on the back would a bad thing!
Now im thinking, to be honest, why dont tyre manufacturers do complimentary front and rear tyres? Since the fronts are 100% steering, whereas rears are more like 70% power and 30% steering, makes sense to me to have different tread patterns front to back?
It's all do with how you treat the car, if driven a too spirited manner in certain circumstances or abused, and mix that with mixed tread patterns and mixed compound and you're asking for trouble.