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Thanks for all above comments.
In relation driving safety this comment is borne out of the fact that he has had a clean license for 10 years and a no-claims bonus for 11, so although Im obviously going to be defensive, it is justified.
With regard to pulling across, it was to make a left turn, on this road you cannot be in the left lane until just prior to the turning. So the only option you have is to stay in the middle lane, indicate then move across after the bus lane has finished. In the incident the bus was a very significant distance behind the car, far safe enough to indicate and make the turning if all road users were diligent but because the bus driver wasnt paying attention the incident occurred. The problem as people have stated that it is going to be one version against another and difficult to prove.
Insurance company probably would have paid for it but because a solicitor is involved the insurance company is not. We were informed that it was a straight forward legal case, and not to lose the built up no claims let the soliticitor sort it out . Although this now seems extremely naive, we trusted legal advice. And I've got no doubt that the insurance would not want to get involved at this stage (or at least pay for the hire car and damage anyway).
The major problem now is that if the bus company do not accept liability (which I obviously doubt they will) and the case is lost through the initially very confident soliticitor - which is a very distinct possibility! Then that is one very large car hire bill, alongside legal fees etc.
Once again thanks for all comments, nice to have external perspective, even if it paints a negative picture!