Macleod,
There's lots going on with reference to this, but basically, in a nutshell, ladders are to be used as a last resort when it comes to window cleaning.
The WAHD became effective in April 2005; yet many window cleaners still routinely use ladders. I still often use ladders, even though I also use a WFP; so I'm not anti-ladder. I just understand the rules.
I've read from two different sources that the HSE aren't going to enforce the WAHD with reference to window cleaners till Spring, next year. Apparantly, it's to give us window cleaners time to get kitted out with WFP!
Even then, I think they'll be mostly innefective at stopping us from using ladders. The poo will only hit the fan when we have an accident.