NS Wing, Poss Door, could have been a lot worse on reflection, Bill not interested, no injuries.
This is another example of police officers being empowered - by dint of (today's) accepted practice - to decide just what merits investigation what does not.
If you're absolutely sure you're not culpable in any way, I would contact the police again and allege that the other driver drove without due care and attention and failed to stop at the scene of the accident.
Should the officer receiving the complaint appear uninterested in pursuing it then ask to speak to their supervisor and, if you remain dissatisfied, I would put my reasons for that dissatisfaction in writing to the Commander of the area in question. Should you be ballicked about or fobbed-off in any way as a result of this, I would make a formal complaint.
As you say, should you have strayed into one of the 'Zil' lanes you would have attracted immediate attention so, as far as I would be concerned, if the authorities are keen enough to throw resources into monitoring these temporary traffic regulations then they should be required to investigate breaches of permanent regulations.
Too many people now seem to accept this attitude from the police and, because of it, the police are inclined to prosecute only when necessary or where success is more or less guaranteed and the investigation does not require the deployment of too many resources.