As a former bike commuter who used to send helmet cam vids to my local police, I definitely got back that response a bunch of times, "we have the plate but not the face of the driver, so it's not actionable for us, even to issue a warning".

Which has always seemed a little nuts, like in case of hit and run it would definitely be possible to take action based on a plate alone, both for police and insurance purposes. Unless the registered owner can point to the not-them person who was driving their car at that time, then it was them. Or it was stolen, but either way there will be a clear paper trail.