I would advise using slx 30
You need to stand back when doing the top floor town house windows, otherwise you will get neck problems, plus as other guy said, you can work pole over cars on driveways etc, or in my case I can do top windows and still be standing outside of the front metal gates, means if I'm doing two neighbours, no faffing about, can walk pole without having to leave one garden and get in to another.
Mr B