You can report a cycling close pass etc if you have video evidence using this link
https://nextbase.co.uk/national-dash-cam-safety-portal/

Certainly in the West Midlands, the police are very proactive on this and there have been many convictions as a result.

I have a cycliq rear light/camera combo and I've only felt the need to upload a video once. At the time it resulted in a warning for the driver but since the recent changes to the highway code, they could probably have now been prosecuted.
I have always tried to be sensible about this as when I was commuting twice daily through city streets, I could probably have technically reported several close passes each week. Sad to say but you develop some kind of 6th sense after a while.