We have also been in this position, a young lad skidded straight into the side of us, and despite the fact that you can hardly smash into someone’s car from the side, that is exactly what he said we did. He also said he had witnesses in the car, he didn’t.
We were at the point of going to court , when he finally withdrew his claim.
More recently, on a tight roundabout, my car and another car touched, just literally momentarily touched. It wasn’t really wide enough for two cars, but he squeezed in beside me.
There wasn’t a mark on my car, but we exchanged details. The insurance company rang me a couple of days later saying he was making a claim for injuries not apparent at the time of the accident.
Absolute rubbish, I was furious that they seemed to accept his word for it.