Cab Licence Wanted: Hackney Cab C60 TXR

This is not a 'fact' as such, just your own experience, I think the general rule is that without supporting evidence it is just your word against his.

What is there to stop me (or anyone) making a nuisance (false) charge against someone I dislike, getting the police to go and 'have a word' and 'give him something to think about' ?

christ.

of course it's a 'fact', as it happened.

and there's nothing to stop you doing that. nothing at all. the police will exercise their judgement as to what action is best to take , in each individual case. if they believe you, and think your complaint is genuine, then there's every chance they might go and have a word. especially if they think it is a serious complaint about a dangerous person.