It's too good a job Tosh. It's perfectly safe when it's dry also I'm only going up to the 1st floor.
I've had a ladder slip from under me on a first floor window. It wasn't nice, but luckily enough I escaped with only bruises and a hurt pride. It quite easily could've been a lot worse.
I know another window cleaner who did similar and ended up with two broken ankles; from approximately the same height. Just because it's first floor work doesn't mean it's safe.
Honestly mate, wooden flooring is dodgy when wet; even with a Rojak I never trusted it.
I don't mean to sound patronising, but even walking on decking when it's wet isn't safe sometimes; Wor Lass has had a 'fun' experience slipping on it (she is a bit of a 'mong' though, at times).
I've read the following here, but it was sound advice. If something feels dangerous, it usually is. Don't do it.
I'd drop the decking job if you haven't got a WFP.
Just to highlight my point again:
If something feels dangerous, it usually is. Don't do it.