Don't go for a domestic grade ladder.
I’ve used abru ‘domestic’ ladders for over 12 years, both double and there triple ladders. I was trad for 8 years and never had a problem, ever.
Being WFP I rarely use them now, but still have them, and still use them when needs be.
For the most part, ladders are ladders. Kept in good nick, and keeping the feet maintained, there should be no reason not to use them.
Having said that, trade ladders aren’t much more, they are usually just a bit heavier.
My old work mate who’s been window cleaning over 20 years, has always used the abru ladders and still does, no issues. They slide easy, balanced well on the shoulder when carrying, and are lightweight, with comfy ladder rungs.
So basically Adam, they all work, they all pass safety tests, they all comply with the law, so just choose a set that works best for you mate, have a gander in B&Q or wickes, or buy online.