Knife crime is on the increase in London, with no signs of slowing down. It is proposed that there is are incentivised knife amnesty programmes that allow young people to trade knives in for rewards such as vouchers, trainers, video games, etc.
You may be interested in these active petitions
Knife amnesty programmes are already making a difference with taking more than 50,000 weapons off the street:
https://www.standard.co.uk/news/crime/knife-crime-amnesty-bins-drop-by-half-in-past-seven-years-a4088241.html
We could probably get more knives off the street by incentivising young people to hand in their weapons.