Just seen that my original post was shunted to "the Belly Locker" for absolutely no apparent reason (?) but for those who were interested, expressed support or concern, here is the outcome.
Result:
After a couple of strongly worded emails, photographs, diagrams and extracted rules from the Highway Code, the other driver's insurers (Allianz) have accepted their client was 100% at fault and totally liable for causing the collision. They have agreed to repair my vehicle and I have not affected my own long No Claims Discount or even notified my insurers.
Furthermore they have offered me £50 for the inconvenience because they should have reached this decision sooner (I did not actually make a complaint about this).
So, a reasonable outcome and the scummy people have lost and will face increased insurance premiums for the next few years....
Result:
After a couple of strongly worded emails, photographs, diagrams and extracted rules from the Highway Code, the other driver's insurers (Allianz) have accepted their client was 100% at fault and totally liable for causing the collision. They have agreed to repair my vehicle and I have not affected my own long No Claims Discount or even notified my insurers.
Furthermore they have offered me £50 for the inconvenience because they should have reached this decision sooner (I did not actually make a complaint about this).
So, a reasonable outcome and the scummy people have lost and will face increased insurance premiums for the next few years....