Far as I'm aware Steve UK legal requires a non fixed blade ( lock knives count as fixed blade as the blade is, obviously, locked to the handle causing the knive to be one unit ) and cutting edge of blade to be under three inches. So a standard Swiss Army knive would seem, to me, to be compliant with that piece of legislation. Don't forget though that anything at all can be held to be an offensive weapon by reason of construction, adaptation or intent in a place to which the public have access whether by payment ir demand. The burden of proving lawful authority or reasonable excuse falls upon the defendant. Which, in a Glasgow dance hall at night for instance, could well mean a UK legal knife may well land one in court with the burden of demonstrating why it was being carried. UK legal is most emphatically not a permit to carry a blade, just a set of requirements to be complied with when a blade is carried in public.
JohnnyO. o/
JohnnyO. o/