The Bridgewater may be wide and deep but it doesn't mean you don't have to slow down when passing a boat.
I've got a mooring on the Bridgewater and feel very strongly about slowing down for other boats. I always do so I would expect people to slow down whilst passing me. This is obviously not the case - I was last out over the bank holiday moored up in a popular spot with lots of other boats and the hire boats, time shares and the private boats all continued to whiz past. I do normally ask people very nicely if they could slow down but I shouldn't have to, I get tired of being ignored and being abused so I just let them get on with it.
There's a few cruising clubs along the bridgewater that have been very suitable renamed flying/speeding clubs.
I think it would be a good idea to keep some sort of list in the back of the log book or something of all the local speeders. Fly past them the same way they fly past us and see how they like it.
Going off subject a bit here, but not off topic...
How many people do you actually let on to whilst passing other boats. And how many people let onto you?
People used to slow down whilst passing and give you a smile or a wave, now they just throttle past you and either don't look in your direction or stare straight through you.
It's the way I see it - not sure how you lot see it.