I find that most motorcycle MOT stations do use common sense when testing the older type british bike.
Normally on my older brits they check tyres, spokes, brakes, swinging arm, head bearings, lights, horn, knowing that it is not going to come up the modern bike spec.
I have found sometimes in the past that the more older tester who grew up with the older machinery, takes into consideration that allowances have to be made when comparing them to the more modern bikes of today