We have had a category made for the TT-Supacats by Craft Insure.
A lot of insurance companys dont like this type of boat because they are basically a race boat but if you ring them up and tell them that you are only using it for pleasure and not racing I am sure they will insure you.They are also very competetive,our Supacats come in at £215 a year,possibly because we had them made to 4.5m.
Try them and mention that Howard with the TT-Supacat put you onto them and I am pretty sure they will look after you...(HOPEFULLY) as I insured one of our other boats today.
www.craftinsure.com