A friend of mine has a 14 plate 1 series BMW and she had the MOT done at a main BMW dealership where it failed on a dangerous because cords were showing on an inside front tyre. Now the garage told her they didn't have the tyre she required and so let her drive off in it to get it replaced herself! I really wasn't happy with that, especially as it was the end of the day so she drove home and only got it replaced a couple of days later, then had to go back to the MOT station for it's retest! So, what would motors do, just chalk it up to experience and explain what she should have done or make a complaint, as they should really have known better than to do that. She's not very savvy about cars in general (her husband dealt with all that before he died) and not a very forceful person and doesn't want to make a fuss, but I'm more of the opinion she should make a complaint.