Mardon seem to be quoting well at the moment and went with them this year
Phone - 01743 232688
<A target="_blank" HREF=http://www.mardon.co.uk>http://www.mardon.co.uk</A>
We use Mercer Jones from hanley, Stoke on Trent. They are very competitive and we have had to make one claim a few years ago that was handled very quickly and efficiently.
I have had really good service from Bishop Skinner. Don't know if they're the cheapest but in my experience their claims handling is superb. I have filled in the claim form online on their website on a Monday morning and had the OK for repairs by email within an hour. Back in the water the following weekend.