> Facts about the new law

As Binglely has pointed out: here's a minor fact about the 'new law': It doesn't exist.

Unless you have a specific reason, say 'a carpet fitter'. Only non-locking knives with a blade less than 3 inches are legal in the UK.
And Khan has no intention or ability to make anything else illegal.

It's clear from the full twitter “No excuses: there is never a reason to carry a knife. Anyone who does will be caught, and they will feel the full force of the law.”
That he is talking about illegal knives. No one will feel 'the full force of the law' for carrying a legal knife.

His other comments make it clear he's talking about knives as weapons (which are already illegal).
“You could be a mum or dad, big brother, big sister, a friend, a girlfriend, a boyfriend who knows somebody carrying a knife, leaving their home with a knife, involved in criminality - there's no honour in keeping that a secret,” he said.

“You should try and prevent that person carrying a knife, leaving home with a knife.”

You think anyone is going to interpret that as making their son remove the little swiss army knife on his keyring?

qjs