A modest proposal
If (i) trainspotters are discouraged from trainspotting, and (ii) police are being reminded of their longstanding obligation to wear identification numbers, perhaps trainspotters could turn to taking down police numbers instead?
I imagine a collaborative website might work here, e.g. “SO 543 was very kind in showing me the way to the station”, “Think SO 258 might be racist”, “SO 330 just attacked my newspaper-vending friend in cold blood” etc.
Obvious problems: police will game the system, police will break their own bloody rules anyway. Needs more thought…

