Be prepared to fight to get it through. Vaguely similar happened to me aaages ago, I was in my folks’ car, stationary, when a truck reversed into us. My brother was in the passenger seat. Driver admitted liability at the time.
But of course that changed when the insurance got hold of it, and claimed we had hit him. Our insurer was useless and wouldn’t chase it. We had to go to the small claims court, which we won as the company just ignored us. We had bailiffs sent to the company, but they got nowhere. It was only when we applied to make the company director personally liable that they caved in and gave us the money. I can only assume it happens a lot and this was their standard approach, because most people just give up at the first hurdle.