For what it's worth, probably not much, in the mid sixties UK Police Motorcyclists were very very good. They had quite a long training course part of which was riding over a longish course not known to the trainee, at the highest speed the trainee considered "safe". "Safe" was in the opinion of the instructor who was following, and could be anything from walking pace right up to maximum. At the time I think the County Police used 650 Triumph Saints, basically a Trophy with 'phone, fairing etc. Later when Neil Shilton moved to Norton most forces bought Norton Interpols, or "Interplods" for obvious reasons. They could be failed at any time, for things like riding too aggressively, or too timidly, depending on the circumstances.
The County police should not be confused with their city/country colleagues who if they were lucky and had a long beat could be riding a Velocette LE, or a Francis Barnett.
In the 70s just after being made redundant, I contemplated joining the Police primarily to become a Police motorcyclist. When I worked out that they were ALWAYS first on the scene of an accident I decided not to apply.
The book "Motorcycle Roadcraft" was required reading for motorcycle riding instructors.
cheers
wakeup