Eric,
I'll be in London from 9/8 to 9/12--any events going on; I'd love to check out the latest Stealths.
Assuming the weather's OK, I'm expecting to be there on Saturday and then do the club races on Sunday. I can't speak for the Stealth sailors, but you're very welcome to come for a sail on the Blade.
Datchet's pretty easy to get to, either by car, or I can pick you up from one of the local train stations. I'll PM you my mobile number.
Paul