In reply to Ruth Clark:
Try NFU, when I was looking at van insurance they seemed by far the most helpful, very competitive. Having had an accident since as well, they were great in getting us and the van home again!
Seem happy to insure "unusual" situations - when I was asking about the self conversion they quizzed on what I'd done, then said it was fine - nothing compared to some "converted" farm vehicles the have do deal with. This was when other specialist van companies flat out refused to insure for various (mainly spurious) reasons!
Cheers,
Stuart