I thought it meant having Bristol as your insurance, but now it looks like they mean you can't have an insurance...
However, as long as the uni is your firm, it doesn't make a difference if you have an insurance or not to the accomadation. You eather miss the grades and go into clearing, or you miss the grades and go to insurance uni. Either way, makes no difference.
That makes me think that the words they used were just confusing...