Hi Hobos, Welcome to the madhouse!
To add to the confusion, if you are at Burnham-on-Crouch, there's an awful lot of shallow water outround that corner of the world, which I'm sure you know turns to mud for a good proportion of the day. A SIB might be a better bet, as I used to sail in the Blackwater & I've never (even in a stonking easterly) experienced anything I would call "big" swell compared to somewhere like Prestwick with the wind in the right (or wrong, depending on your viewpoint!) direction. (That comment based on sailing a Laser)