my answer would be, in your shoes, as you offer both that it would need to be done early due to the foot traffic, i.e 7.30 ish before the high street became to busy, and either wfp or ladder could be used, leave you to decide that one , you will be long gone before the bookies opens if you use wfp so they will not know who splashed there windows, and ladder no problem anyway, I like these jobs if they agree as it lets me do domestic while doing shops
either way whatever you decide wfp or ladder on a high street in normal hours is a nightmare, and I would avoid