Follow the trial of Metropolitan firearms officer Martyn Blake, who has been charged with the murder of Chris Kaba. Chris died from a single gunshot after being stopped by police in Streatham, south London, on Tuesday 5 September 2022. Martyn Blake, who was previously known only as NX121, has pleaded not guilty to murder.

In this episode reporters Adina Campbell and Ross Ryan follow the trial as it continues, with Martyn Blake's colleagues - nine of them in total - entering the witness box. And we find out more about the job firearms officers do from a former strategic firearms commander.

Producer: Ross Ryan