Reporting: Jason Farrell, home editor. Production: Nick Stylianou, specialist producer

Several months embedded with MO19, the Metropolitan Police’s firearms unit, at the point when the murder charge against one of its officers over the shooting of Chris Kaba had left colleagues asking whether the job was worth the risk. Riding with Trojan One to the incidents nobody else is sent to, the piece follows the officers who carry guns for a city that mostly wishes they didn’t, and asks what happens to armed policing when recruits stop applying. The companion piece to the Sky News documentary Firing Point.