winjim
Smash the cistern
Am I right in thinking that all offences are technically committed against the crown?Wot Jim said. There's evidence of an offence, common assault + deposit an item on or above a highway which could endanger the user of a highway, so if the motorcyclist reports it the police must record the crime.
Whether the CPS would prosecute without a victim is a different matter entirely, but if the chump in the car has no or very little previous he'd be eligible for a caution anyway should he admit it, and with the quality of the evidence it'd be a bit hard not to cough that.