One thing to be very wary of though - don't trust a conversation with a DVLA/VOSA representative to be definitive. Recently, whilst trying to register a recently IVAd Westfield, the owner was instructed to grind off the Westfield chassis number and await a new one to be issued. Thankfully, the owner questioned this repeatedly until it was finally acknowledged that a mistake had been made and that the factory applied chassis number was in fact OK (like that's a surprise).

We SORN our Westfield every year for around 6 months over the winter. During that time, it has always remained insured on the standard road-use policy.

I too would like to see something in writing on the official website - hopefully this is nothing more than a confused DVLA rep.