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I'm looking up the local knife laws.
They're amazingly lax.
You can carry anything you want, even swords (guns need a licence though), as long as you're not wearing it openly or in an aggressive manor.
If you end up in a situation that requires protecting yourself or others, they will look at your behaviour towards the matter and how you acted in the situation to determine if you acted in a manner that would suggest that you intended to cause permanent harm or even death.