With exclusive access to the parents of Chris Kaba, who was shot dead by armed police, Panorama investigates what happened on the night of the fatal shooting. Reporter Greg McKenzie speaks to insiders from the Met and the Independent Office for Police Conduct, which provided evidence used to charge firearms officer Martyn Blake with murder. In the wake of the not guilty verdict, Panorama asks what's next for the Kaba family, Martyn Blake and the Metropolitan Police.