Their website is blocked at work, but I'll check it out later.
I fear it might be a bit serious for me:) I've never made a boat before, and were I to have a go I'd make an inappropriately powerful / fast one. I could probably do without boat anoraks watching me smash it into a rock or something...
You can't just turn up and run (as I found out) but they are taking new members.
http://elmbridgemc.net/index.php
Membership is about £50 a year but with a sting of a £90 registration fee. (However u can pay in instalments)
Looks like they have some serious events but a mix of recreational / competitive enthusiasts.
https://www.youtube.com/watch?v=GZZ5X0Y_MHc
Amazing what brushless can do against IC now.