> Would this be illegal in the UK? I think those are legal, I think you've got it reversed. Knives that lack some kind of mechanism that locks the blade open

> Would this be illegal in the UK? I think those are legal, I think you've got it reversed. Knives that lack some kind of mechanism that locks the blade open are illegal (e.g. a butterfly knife). Thinking about it, I think that section is to specifically ban butterfly knives. That's the only style of non-fixed blade knife I can think of that doesn't have a compliant locking mechanism.