hannaH's car just failed on "Excessively Pitted Brake Discs" ... yeah, they're nasty looking, but still work well enough to tear up tarmac if you hit the pedal hard!
(Yes, they are, and no, he doesn't charge for retest within 7 days)
So ... What's your vehicle failed its MoT for?
I'll start with:
Kawasaki GPZ500S
Front brake seized ... AT the MoT test centre. Had been riding bike every day to work, rode into test centre, took 3 people to push it out...