Two or three years ago, I had an informal chat with an off-duty HSE inspector.
She told me that if a Window Cleaner had a serious incident involving a ladder, then they might have to get involved, but as far as she knew, the WAHR 2005 was not really intended to be used to "bash" one-man operators, and she, and her colleagues relied on us using our common sense, and keeping "out of mischief", as she put it.
Baldeagle