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The maximum penalty for an adult carrying a knife is 4 years in prison and an unlimited fine. You’ll get a prison sentence if you’re convicted of carrying a knife more than once.
Basic laws on knives
It’s illegal to:
sell a knife to anyone under 18, unless it has a folding blade 3 inches long (7.62 cm) or less
carry a knife in public without good reason, unless it has a folding blade with a cutting edge 3 inches long or less
carry, buy or sell any type of banned knife
use any knife in a threatening way (even a legal knife)
Lock knives
Lock knives are not classed as folding knives and are illegal to carry in public without good reason.
Lock knives:
have blades that can be locked and refolded only by pressing a button
can include multi-tool knives - tools that also contain other devices such as a screwdriver or can opener
Banned knives and weapons
It is illegal to bring into the UK, sell, hire, lend or give anyone the following:
butterfly knives (also known as ‘balisongs’) - a blade hidden inside a handle that splits in the middle
disguised knives - a blade or sharp point hidden inside what looks like everyday objects such as a buckle, phone, brush or lipstick
flick knives (also known as ‘switchblades’ or ‘automatic knives’) - a blade hidden inside a handle which shoots out when a button is pressed
etc
etc
If I knew someone was breaking the "knife" law I would report them to the police immediately.