This is clearly unacceptable but I would hope it’s just a handful of jobsworth officers acting like this as they really need the public onside for this long haul Alot of people get quite nervous when being dealt with by the police and reading the story it seems that is exactly what’s happened here. But the important to highlight that they hadn’t broken the law however by accepting a fixed penalty you are admitting the offence. Remember you do not have to accept a fixed penalty! If you are sure you haven’t broken the law refuse it, the officer will then have to charge you ( you won’t be arrested for something pissy like that , it’s done on the spot) send any evidence of criminality- (in this case none because it’s not against the law to drive short distance for exercise) to the procurator fiscal who will have to decide whether to start proceedings or dismiss the case , no evidence =no case Or, more likely they will just give you a verbal ticking off and leave you alone. It’s not unreasonable behaviour to expect the police to do their job properly