Doctors are demanding the right to go on ‘heat strike’ as temperatures are set to soar to 33C over the next few days.

Members of the British Medical Association (BMA) are calling on the union to demand that the NHS adopts a ‘national maximum workplace temperature’.

They said it should support staff to take ‘heat strike action’ if the temperature rises above this threshold, allowing all non-essential staff to walk out.

The limit should be set using available evidence, it added.

Some estimates suggest that staff concentration is affected from 24C, while the NHS says vulnerable patients could suffer at 26C.