Thanks, I had heard that they were getting out of the 3rd party market. As this appears to be the minimum feasible insurance for long distance, and other forms of insurance appear to be very expensive or unobtainable for single handed work, there appears to be a hole in the marketplace.
I think you will find www.basic-boat.com does, but their site is under re-vamp at present, so can't be sure. I had my old boat insured with them and I'm sure there was an unlimited distance option.