OK, an update ;
I've been contacted by the police about this after I emailed them and the response is close passes of less than 1.5m will not be actioned unless there are further aggrievating circumstances. So, if a car goes past you with a judged clearance of 0.75m and nothing else then no action is likely outcome.
If however said car goes past at 0.75m distance and there's another vehicle coming towards you in opposite lane and that car is forced to move over to avoid collision then that is deemed an issue. Or if a vehicle overtakes on a blind bend crossing a solid white line etc.
So, keep recording your rides and sending in clips is the advice but be aware only "the worst" likely to be actioned.
Yes, the one I submitted a few weeks ago got the response that action would be taken, but again, there was a car coming the other way, whose driver was concerned enough to blast their horn at the one overtaking me (much too closely).
£1200 fine for that! The cyclist possibly unwise to pass the parked car with a car coming in opposite direction at the time but that's a non event. The cyclist endangered himself not the car driver.
To me that smacks of the police and magistrate making an example and taking umbrage at the cyclist challenging the decision.
It does seem a rather high fine, the norm would be much lower than that for careless cycling ( or careless driving).
It was a poor decision by the cyclist, but £1200 is excessive, although part of that is costs. The fine was "only" £1000, but that is the maximum for that offence. Courts alwasy do tend to give harsher penalties for people who don't plead guilty, and apparently means testing also entered the equatoin, but it still seems excessive to me.