A metal plate with a continuous weld is perfectly ok for repair and an mot. A fibre glass repair is dangerous and unacceptable for this . However, you need to be careful, as some subframes are filled with a fibre glass or similar material for sound insulation/ vibration purposes
Actually, it sounds like its the MOT tester that needs to be careful. Maybe this one wasn't.
IF the original repair was a weld, failed, and exposed underlying glass sound deadening, you probably don't have any comeback on the original repairer after that long. I doubt pro MOT welds are usually rustproofed much, if at all, and wont be guaranteed for long.
IF it was originally fibreglassed, you might have comeback IF you can catch them, but I'd think its a bit unlikely. Fibreglass is used by amateurs because they don't have access to the right stuff.
For a pro I'd think its almost as much trouble and expense as a weld, and quite a lot more criminal
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