"Every person driving into an ASL after the light changes is an offence, every driver reaching the 10% threshold is an offence, every bald tyre, blown light, empty screen wash bottle."
Actually, thinking about this... Every single commute there will be at least one, but usually many more, drivers go past me breaking the speed limit. Most ASLs have cars stopped in them. I'll pass a number of cars parked on pavements that will have been driven there. Cars will be stranded in hatched areas. And you'll always see people on the phone. And not one single time on my commute, not once, have I seen the police dealing with any of those drivers.
I'd go for a (very) conservative estimate of 5 drivers each commute breaking the law. So ten a day, 50 a week, roughly 1750 a year (as I don't work every week!). That's just me, commuting 4 miles each way, 40 minutes worth of riding. 1750, a conservative estimate of the law being broken. That would only need 195 cyclists to record those 340,000 offences in the year.
Again, not saying that cyclists shouldn't be targetted, but it's a fallacy to believe that motorists are being hammered left, right and centre because we all, every day, see law breaking going unpunished.