I'm a Brit and carry my Leatherman Wave (inc. one-hand opening blade, locking)on the odd occassion, usually only when I know there's a task I'm going to need it for, altho I do keep it handy around the house. I think the main legal issue for multitool carry in the UK would focus primarily on the blade length (2" for an EDC technically). However, I've seen other ppl carrying similar multitools openly, and whether a copper would confront them over it would probably depend, as far as I can tell, on the situation it's being carried in (e.g. at a rowdy footy match it'd definitely betreated with a lot of suspicion) and the copper's own discretion. So my wariness about carrying my multitool on my belt openly is more to do with scaring 'sheeple' into asking questions all the time.
Btw, I think Leatherman probably scores highly partly cuz of brand-recognition: most people think multitool, think leatherman - except I'd prob got for a Gerber next time.