The driver of the other car has been in touch with mum. First off she was a bit gobby and said the car didn't need a new bumper.
Mum explained the guy at VW said it would, the clips are broken/bent, the 'padding' is crushed etc.
Mum also explained she didn't spend that much on a car to have a mend it ish job done on it.
The other driver has given mum her insurance details

£602.xx bill. Plus mum gets a courtesy car whilst hers is fixed. Go mum, cant fault her