Probably best to change the title of the thread, this has nothing to do with LED headlights failing an MOT as they’re not LED headlights - they’re halogen headlights with aftermarket LED “bulbs” fitted. As they’re not approved for use (an MOT pass is not the same as being legal) the tester was in his rights to fail them out of hand, no need to cite missing washers or self levelling.
Having said that, my van passed its first MOT in Feb of this year with aftermarket LED lamps fitted. I watched the test and after looking to see all the lights came on, the tester checked the alignment was ok (it was) and then moved on to check the next item on the list. It’s all down to the tester, but a pass doesn’t mean they’re legal and, as others have said, they would be checked by an accident investigator so you would want to satisfy yourself that they didn’t present a risk to others in contributing to a possible accident before talking the calculated risk of installing them.
Having said that, my van passed its first MOT in Feb of this year with aftermarket LED lamps fitted. I watched the test and after looking to see all the lights came on, the tester checked the alignment was ok (it was) and then moved on to check the next item on the list. It’s all down to the tester, but a pass doesn’t mean they’re legal and, as others have said, they would be checked by an accident investigator so you would want to satisfy yourself that they didn’t present a risk to others in contributing to a possible accident before talking the calculated risk of installing them.