I've have received the following from Thames Valley Police
As per our conversation the other day here are the details as discussed.
The Audi that collided with your vehicle was believed to be insured. However the insured address was visited by our colleagues and the person they spoke to confirmed they had sold the car on the 1st of September. It's therefore a possibility that the new driver has not insured the Audi.
The Dash cam footage from the gentleman that stopped has not been successful and on further looking it does not read or allow us to read any number plate as vehicles travel past his van.
With this we are unable to investigate further unless we are able to find out further details of who purchased the car.
If I get any further updates I will let you know but It will not be until after the Queens funeral as we discussed.
Kindest regards
Ben