I'll have to drop in at Prosport next time I am on Guernsey. No, I don't know Dominic or Jason, although would be nice to ask them if they know anyone who does chartering trips from mainland France to Guernsey and/or Sark, as I have been getting some hefty quotes from those who advertise on the net.
I go quite regularly and it is getting damned expensive. Am even thinking of looking at chartering courses (mainly to get better acquinted with the waters as the rocks and currents can be treacherous) and doing the trip myself. Do you know of any in Guernsey?