“This can be as simple as letting people wear more casual clothing and providing proper hydration. High levels of UV exposure also mean that outdoor workers have a much higher risk of developing skin cancer. “Simply allowing more breaks and providing sunscreen and protective clothing such as hats with hoods can help reduce this risk. “Ultimately there should be a legal maximum working temperature, the same way we have a legal minimum working temperature. And it’s in the employer’s best interest – workers who overheat won’t be at their best.” Ms Mann also called for employers to provide fans – or the right to fans – to workers if they work in a house with excessive temperatures. He added: “We would also advise members to have extra water, keep windows/doors open where possible and close blinds or curtains.”