If fully comp your insurance will fix the van and claim the money back from the person at fault, this may take a bit of time
and you could lose your no claims until its sorted in court, but any money lost as a result can be claimed back.
Its a nightmare I got the back of my van wrecked by a guy who then denied the accident happened, luckily unknown to him I had photographed the damage caused to his own car, this left him with nowhere to go.
Took a few years before it was sorted and to be honest I had to threaten my own insurance company (Axa) with legal action to get them to finally sort it.
Hope it goes well for you mate, but any nonsense get to a solicitor asap.