Good article on the topic at:
London Mayor: “No Excuses: There Is Never A Reason To Carry A Knife.” – JONATHAN TURLEY
Quote:
... I have been critical of Khan’s anti-free speech record — part of a trend in Great Britain to regulate and criminalize unpopular speech. He is now combining that record with increases in police powers.
The current law bans knives longer than three inches and limits possession to folding knives. Here are the guidelines from the Metropolitan Police website: ...


No further comments, it’s a good read.