UK Fitting room pee tips, help would be appreciated :)

[88mphArtist 970]

So I live around Edinburgh/East Scotland and I've been wanting to fulfill my dream of properly peeing in a fitting room and was curious which stores might be the best to mark and get away with it? Some like Asda don't have fitting rooms at all, and ideally I'd want somewhere with some combination of long curtains, low security, carpet, and perhaps a stool/bench to piss mark. I'm not from the UK originally so I'm not familiar with the stores here. I do plan on doing a reconnaissance mission as well haha

Thank you kind pee peeps 😊