You raise a number of issues.
The first point to make is that actually in the UK we don't have a free standing right of privacy. There were attempts to make the Human Rights Act extend in that direction but they failed fairly spectacularly. The Michael Douglas and Catherine Zeta Jones wedding was an instance in point.
It wasn't the best case to raise this point and unfortunately it made law or.
However, here you could argue that the issue is not privacy of itself but the fact that he is harassing you. In fairness, I think but most people would think that taking photographs in a hostile way amounts to harassment.
That is especially so if he is doing things like making false allegations to the police about you as actually that is a further act of harassment as well.
If the police will not give him a harassment warning then you do have the option to get a solicitor to write to him warning him that his actions amount to harassment. That is not expensive to do. You could probably do it for £100 plus VAT or maybe less.
Be prepared for him to go completely ballistic when he receives it. He sounds like that sort of person. If he commits further offences though then you can call the police.
But can I clarify anything for you?