Season: 13 | Episode: 1 | Length: 60m

Cameras follow the staff of London Ambulance Service, witnessing the unique challenges that come with caring for a city of nine million, where the nation's struggles are often amplified. Workers attend to the needs of patients who have been sprayed with an unknown chemical before the tactical operations centre receives an urgent call to a multi-storey block of flats, where a flat is on fire. The decision is made to declare a major incident, serving as a harrowing reminder of the Grenfell Tower fire for all those called to attend.