we had one of our vans rear ended 2 years ago , sent the pictures into them and because it had a roof rack there tried not to pay out as i didn't declare it , after many phone calls it boiled down to weather it was factory fit of not and weather i could prove it was and weather they could prove it wasnt , this was a non fault claim , and it was my own insurance
when i explained it was a exaa sign van ( witch it was ) and that the aa ordered many many type of vans to do different jobs and spec , and after i had sent them pics of where the side rack hand been fitted they said it could of been ordered from the factory and they covered it !
aviva will void the insurance if the van is covered more then 30% with sign writing did you know that ! nearly got caught out with that one as well !