Have just gone throuh the process for my new RIB. My old RIB is a 4 metre, and that is insured with Armada of Worcester. However, they were not competetive for my new RIB. Mardon have given me the best quote by far. They advertise in the BIBOA magazine and do a specialist RIB package.
I did try the CIs and others, but they dont really seem to understand boats - and I wonder what the service would be like in the event of a claim?
Their contact details are:
or 01743 232688 or firstname.lastname@example.org
Hope this helps