The big problem with pouches, at least over here in the UK, is the fact that they advertise your 'tooled up' status to the old bill
I'm a big fan of the Leatherman pocket clip, with the tool clipped into a back pocket. I do the same with folders.If the tool has a no fuss carabiner (like the CRKT Guppie), I use that and clip it to a side belt loop.
If I was you UK guys , I'd get a pair of black coveralls , an MP5 and a Glock , act like an arrogant plonker - everyone would assume you were the local armed response unit hunting terrorists . You could get away with blue bloody murder !Chris