Ambulance: Series 1

With calls doubling in number over the past 10 years, the nerve centre of the London Ambulance Service takes over 5000 calls a day and has to work out who needs an ambulance quickest, or whether they need one at all. An ordinary day for the service means dozens of car crashes, overdoses, suicide attempts and - statistically - 28 cardiac arrests, where every second can make the difference between life and death.