My wife as taken her electric bike which has a throttle on and has never had any problems with the police. We were told a couple of years ago that if the police were around not to use the throttle. We have not even noticed the police taking any more or less notice of her at any time.
1964 I joined the Army in boys service, We did as we were told and if you complained you were put on a charge. you had to learn if you didnt you were kicked out. The main thing was you learned respect (it was eaddy to do if you were bought up properly ) unfortunately that is a lot of the problem today.