jonathan18:
I don't think that's what they meant - I'm assuming they mean if someone has a full insurance policy on their own car, whether the person who caused the accident has third party insurance or not they'll still be covered for damage to their own car through their own policy. But fair enough point as it could be misinterpreted...
Except in the UK full insurance is not compulsory, the minimum is third party.
And you would want to claim on other person so you don't lose your no claims bonus.