I agree! My 'usual' MoT test station, 400 metres down the hill from me, is the local Suzuki and Yamaha dealer and are the only MoT place in Newbury. They have two qualified testers, one a nice, charming guy who is most reasonable. The other is a nasty piece of work who really doesn't like BMW's, keeps me waiting ages for the bike even though the test and all paperwork is complete and will fail a bike at the drop of a crash helmet.
Which of these testers you get on the day is anyone's guess; guess which one I usually get!
He failed my GS for having additional brake lights that 'flashed on and off when the indicators were flashing'. They weren't really, they were LED indicator units from NN and had two sets of diodes, one yellow set around the periphery of the light that were the indicator units and a second set of red diodes in the centre that could be wired to either the tail light or the rear brake, which is how I had them wired. Despite taking the lens off and showing him the damn things didn't flash on and off, he wouldn't have it. 'It looks like they flash and that is good enough for me!'.
Despite the bike having its MoT at NOG for the last two years, I still get the jitters

Brian (who discovered the nasty one is actually human when he threatened to fail my immaculate, 23 year old, 800 mile old Honda CBR1000 F-H 'because it had a dead fly on the edge of the headlight lens'

)