in accordance with their force collision policy which states that they do not investigate collisions in public/private car parks.

That's quite a bit different to when my daughter had her nearly new car hit by an uninsured driver in a supermarket car park and in my opinion quite remiss of them. What about a serious fatal, accident?

I suspect that the policy relates to minor bumps like that reported by the OP and in practice, in the absence of serious damage or illegality, would also apply on the roads.

Obviously if there's a body or legal issues such as lack of insurance different considerations will apply.

in accordance with their force collision policy which states that they do not investigate collisions in public/private car parks.

That's quite a bit different to when my daughter had her nearly new car hit by an uninsured driver in a supermarket car park and in my opinion quite remiss of them. What about a serious fatal, accident?

They would investigate a fatal accident I'm sure.

Do you want the police to investigate a case like this?

I remember a time when bumpers were there to protect a car from damage. They'd accumulate dings, scratches and bangs over time and then you just put a fresh one on.

Now they're huge plastic items basically an extension of the main car, cost a fortune and incredibly difficult to obtain cheaply.

In the 70s my family ran a SAAB 99 Combi something or other with huge rubber bumpers. Well they seemed huge at the time compared to the chrome flimsy things other cars had.