You can buy lengths of Velcro from Halfords, no need for screws mate.I had a similar problem with mine. Had it MOT'd a few weeks a go at the same garage that I've used for the past 3 years. Went in to collect it and the guy at the counter said it passed but needs some reflectors fitting... Now I have the Jewel rear lenses and have had them fitted for the past 6 years, maybe more, and yes I know by law you are suppose to have a rear facing reflector but it's never been picked up. Not even an advisory or a passing comment to say that they are needed but have turned a blind eye.
Anyway the MOT man decided it would be acceptable to screw some cheap reflectors to my mud flaps. So these are now ruined as they two flipping holes in them...
Wasn't me who screwed them on. It was the MOT man who did it without asking me first. Turn up to pick it up with a fresh ticket and saw them fitted.
Will just ditch the flaps and refit it for next year MOT
This is TERRIBLE! You should've made the garage replace them.