Do you have an f1autocentre near you? My nearest one is advertising MOT for £24.95.
Last year they could have failed my car because the rear central seat- belt was jammed and couldn't be used. Instead, the tester called me over and asked if I would like him to try a fix. He spent 15 mins. of their time, fixed it, didn't charge for it and passed the car. I was so pleased and really impressed with them.(After asking the manager if it would be OK, I gave the tester a fiver for a drink).