Bringing anything anywhere public with the intent of using it as a weapon, even the skateboard, is an offense in the UK. The discourse and social environment is just completely different; despite our own endemic violence issues the UK is simply a less deadly country.

https://www.cps.gov.uk/legal-guidance/offensive-weapons-kniv...

“any article made or adapted for use for causing injury to the person or intended by the person having it with him for such use by him or by some other person”.