had the same happen to me years ago, older lady reversed into me while parked behind her waiting to fill up with petrol
not much said at the time, just exchanged details, but once the husband got invovled it turned out it was my fault and he wasnt willing to pay, even though the parts i got quotes for was less than he got as I had a friend working in the trade. He even mentioned that they had a witness
kept my temper and said fair enough, leave it to the insurance and my witness will be saying they were behind me and saw no moment, next day he paid up
as much as i respect the older generation, some of them shouldn't be thinking that everyone younger is thick
make the claim form clear with the pictures you have shown and detail everything, even his comments as its clear to me that they have forgotten the highway code of giving way at a roundabout