We spend months with Hackney Integrated Gangs Unit and eventually get their number one gang member to speak to us.

Presented by Tracy Ollerenshaw. Drugs, Drill and Doing Time is a four-part series that follows the story of 17-year-old Yusuf, a notorious London gang member who's facing jail for carrying a knife and acid.

Produced by Tracy Ollerenshaw, Toby Sealey and Will Chalk.