Another update:
The accident management team I had been dealing with "Enterprise", were completely and utterly useless not to mention they told me all the wrong information! I ended up speaking to y insurance company instead who say "You are not liable for the accident" and when he read out the comments his colleague had written about the dash cam footage he stated "Car was speeding and attempted an overtake narrowly missing a sign" needless to say Kelly was very pleased they have sided with us.
However, the other party have not taken liability for the accident and we cannot do anything to repair the car as they may still want to investigate the cost of the damage, even tho I told him I've got a front bumper sitting in my lounge, "just needs painting, it's going to cost less than £200 for the repair, how can they complain with that!".
So hopefully in a couple of weeks they will have it all sorted and I can paint and fix the bumper