I'm from the same area as squeaks, I would almost agree with him on this one, there are 6 window cleaners that I know for sure are WFP and work the area.
1. Myself.
2. Tosh.
3. Tomo.
4. a guy called John.
5. A guy called Sean (and his wife - Omnitrolley's)
6. Don't know his name (Tosh does though) but has made his own trolley system.
Trad (that I know for sure)
1. Squeaky
2. a guy called Simon (tosser)
3. Old guy called George
4. strange creepy guy with flat cap

5. a guy called Ian Meredith
6....erm...there are more of course, but I can't name them...maybe squeaks can describe em (or name them)
Ian