It's not as bad as it was....
A few years back someone (prolific on this site at the time) was charging people for a window cleaning h&s training course. I believe there was some kind of con so he was getting like £1500 per person off the government too.
According to some of the
mugs folk who went on it he said that:
1. While cleaning windows you should have a cordoned off saftey zone with a distance from the operator at least the full height of the pole. No idea how he imagined that was in any way "reasonably practicable" on a residential round.
2. There is NO safe, reasonably practicable way of cleaning a window above a flat roof. People paid him money for that golden nugget.
I don't clean windows above flat roofs because it's easier and more cost effective to avoid carrying ladders and clambering up them (or hiring a cherry picker, erecting a scaffold tower, bungee jumping from a hot air balloon, whatever) for 0.001% of the windows out there. That's my decision. However, if I were charging people money to show them the safest way to clean a window, I'd show them the safest way to clean a window.
Not seen him on here in a while and his h&s "training" business has been dissolved, meanwhile the window cleaning industry carries on without 30ft force fields and everything is fine.