Cardiac arrests in London jump by third during heatwave as temperatures soar on Tube, says ambulance boss

Cardiac arrests in London jumped by a third during the heatwave this week as temperatures soared on public transport, the capital’s ambulance chief has said.

Jason Killens, chief executive of London Ambulance Service, told how the number of 999 calls received soared by around 50% from some 5,500 to around 8000 on Wednesday, when temperatures spiralled to 35.1C in the capital.