thedonal

If you've got a witness, then your onto a good thing already. So, even if the other party denies involvement, you've got some backup to push further. If they've reversed into your bike, which was parked, I would not even entertain anything less than a full claim against them.

With a little luck, their vehicle may be marked by the bike also- unless they've had it sorted already. Even then, it could possibly be proved that they had the damage repaired and went further to cover their tracks.

But just asking the insurance company shouldn't go as an automatic claim against you.

If you can afford the initial excess (if required) and you feel like you've got enough in your favour, I'd push all the way to get the bike fixed up as it was at the other insurer's expense...