Given the success that I had reporting a rather close pass (contact, paint transfer) in Coventry, I wouldn't bother doing it again without camera evidence.
The rate of reporting of what close passes there are is likely to vary more than the rate of close passes, especially in Coventry.
Coventry seems to be very keen on anti-cyclist measures, like "cyclist dismount" signs up to 1/4 mile from roadworks, cycle lanes on which cycling is banned, and obstacles that mean you need two people to lift a bike or motorbike over.