Dave,
I got hit in a car park whilst I was in the shop, other driver drove off but a Golf VI owner saw it and took details. I reported it to police and they took it up. They advised not to involve my insurance but go via a no win-no fee route so I declared it to my insurance company for info only. ( I had actually already reported it before the police came round and then "un-reported" as a claim afterwards)
Any way I won and got fixed for nothing via a top notch body shop and no premium increase either although it is on the record.
So, are there any witnesses? CCTV footage? Marks on road?
I would call the bus company on Monday and tell them you're taking it further, after all, you're already "accepting" 50/50 so give it a try.
Hope you get fixed up quickly,
Regards,
John