My approach to MOT's is that its wise to look for obvious failings that are cheaply rectified yourself in advance, but what one MOT tester passes, another may fail so you can end up doing work that just isn't needed. If it fails it fails, jusy sort out what has to be done.
I actually take mine to a commercial vehicle tester in Coventry who is very strict but by the same token, fair. For instance, last time it failed on headlamp alignment which they said they would not rectify for less than £20 cos adjustment screws are frequently rusted solid. As soon as I heard that, I nipped into the back, came out with a screwdriver and removed grill trim in seconds and explained that i KNEW for sure that light adjustment screws weren't rusted solid as I'd moved them within last 7 days. He grinned and said "ok, we'll do it for a fiver" and set the beam alignment gear up there and then - result, PASS.
He knows I go there every year and don't mind waiting (they're always busy) so is reasonable. I'd much rather he picked up on anything I need to attend to.