Grumps - very good question and I had been wondering the same. I do most of my boating from either Brightlingsea, Walton (launching from Titchmarsh marina) and Burnham (launching from the Yacht harbour). It would be good to get a group together for a few planned cruises just like the solent lot seem to do on a regular basis. There are plenty of rib owners in the area as I have seen a number of boats around the Blackwater/Harwich areas.
Hopefully this can be the start of an east coast cruising club!