I recently spent a lot of time phoning round for insurance when I upgraded to a bigger RIB, I settled on Mardon not only because of cost, but because my existing insurers had changed their policy so that even when wheel clamped I could not leave it unattended at say a motorway services. Basically the boat needed to be attended at all times unless clamped and locked behind a barrier.
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club