I'm not sure why you're worried. If they're not attending, don't bother either, unless you want to try and claim your excess back from the other party (although presumably there was some fault apportioned to you because otherwise there would be no excess deducted since clearly the other party was identified).
There are no lawyers at the Disputes Tribunal either.
Oooh, that could be some extremely bad advice.
The insurance policy almost certainly has a clause stating you have to assist your insurer and if you don't you risk having your cover voided. I wouldn't put it past Youi aiming for this outcome.
So whatever you do, turn up. Failure to do so could be very expensive.