This is so wrong I don't even know where to start.
I am a regular London and rural cyclist. Lots and lots of cars, vans and lorries get very close, sometimes force me over and occasionally brush against me.
I have children (12, 15 & 17) who cycle along rural A-roads with artics sweeping past them and then sometimes cutting in slightly before they ought to.
A few months ago a VW Transporter with a long trailer braked very hard immediately after passing my son (smoked trailer tyres) and cut left on him. Son had to brake heavily, but there was no contact.
These things happen. It's a part of life.
I just can't get excited about near misses and I really don't know what else the Police could have done in the OP's case.
When I've been burgled (twice), they've been excellent.
When friends have been attacked or assaulted, they've been excellent.
When I've been walloped in a big collision (motorcycle and bicycle, severally) they've been excellent.
When I had a motorcycle stolen they were excellent.
After a death when an officer had to visit with the hard words, they were excellent. (I'd hate to have to do that for a stranger).
When they caught me riding a motorcycle underage in 1980 and I was banned before I had a license, they were also excellent; although I wish they hadn't caught me.
The Exchequer is not a Magic Money Tree. There was a judgement call to make in the OP's case.
I think the police officer who listened politely and then took no action made a good judgement call.
Your perspective clearly differs from mine. You may well be right; I may well be wrong.
Unusually for an frequently-fined speeder, I agree with the use of resources to curb my throttle-happiness. The fines and points are entirely my own fault. I would not agree with police officers spending time investigating the OP scenario.
Your reaction (quoted) gives the impression that you find my view so contemptible or risible that it doesn't deserve a response.
You may be surprised that it would be the response of very, very many reasonable, law-abiding, bicycle-riding people across the land.