I case you did not know VOSA operate a comprehensive nationwide roadside checking system for LGV and PSV. Primaraily to check for roadworthyness, overloading, driving hours offences but also I have seen customs and exsize diping tanks for fuel duty dodgers.
So I am afraid it is already here in some form, I dont mind road side checks for cars and bikes if they are quickly completed with minimum of fuss. If you have an up together bike you have nowt to worry about. If you are riding a bike in dangerous condition you might be glad to be told.
However I do strongly dispute that only manufactures parts be fitted as this would monopolise the parts suply and kill of custom bikes over night. If its well made and is capable of meeting mot standards then thats should be the end of it. I think this topic will be a hot one
T1pper