From chefs to paramedics, workers tell the Guardian how they are coping and unions outline the changes needed in the workplace
In the sweltering kitchen of the Plimsoll pub in north London, the head chef, Joshua Swinney, has a frozen tea towel wrapped around his neck to combat the heat.
As temperatures exceeded 35C (95F) in the capital, workers who were not lucky enough to be in air-conditioned offices sweltered in the heat.