A knife Tsar? Are you fucking kidding me? If you want to deal with knife crime it's simple.
Increase stop and search
A minimum sentence of anyone convicted of carrying a knife without good cause of at least 10 years in prison without parole.
A minimum sentence of anyone convicted of attacking someone with a knife of at least 15-20 years in prison without parole.
A whole life sentence without parole for murder.
Make prisons less like holiday camps and more like actual punishment so as to act as a deterrent.
https://www.bbc.co.uk/news/uk-47440487