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Jeremy Corbyn is attempting to ban physical work in temperatures above 27C as Britain basks in its hottest July day in history.

While most Brits were outdoors to feel the mercury hit 36.7C, the Labour leadership hopeful was in the Commons writing a motion on heat in the workplace.

Mr Corbyn, by far the most left-wing of the four candidates for Labour leader, says he's worried that maximum temperatures aren't laid down by the law.

Instead the Health and Safety Executive gives guidance that offices and shops should be warmer than 16C, with no official maximum.

Mr Corbyn's suggestion would ban all workers from having to do their jobs in temperatures above 30C.

(Image: WENN.com)

That would shut down wide parts of the London Underground, where commuters and staff sweltered in 35C heat today.

It could also affect ground crews at Heathrow Airport, where the record-breaking 36.7C temperature was recorded today.

For physical work like building sites, the temperature would be three degrees lower at 27C.

The suggestions are in an Early Day Motion (EDM) which Mr Corbyn tabled today and will appear before MPs tomorrow.

Although an EDM isn't a law in itself, it acts like a petition and Mr Corbyn will be asking other MPs to sign if they agree with it.

(Image: Reuters)

Mr Corbyn's attempt comes after the TUC said bosses should allow office workers to wear vests and sandals in the heat.

He said: " In this weather, high temperatures aren't just a problem in heavy industry but for millions of workers have been struggling with the heat in offices, schools, shops, call-centres - you name it,.

"Good employers will have been taking steps to help out their workers in the heatwave.

"But putting a maximum temperature into law will give everyone a legal right to basic protections from working in unbearable conditions."

(Image: PA)

His EDM also commends the Women's Tennis Association for introducing regular heat breaks for competitors at Wimbledon.

There's been anger today over the lack of similar breaks for men despite the pleas of coaches including Andy Murray's mum Judy.

Jeremy Corbyn is still a 16/1 outsider for the Labour leadership, trailing behind frontrunner Andy Burnham, shadow home secretary Yvette Cooper and shadow care minister Liz Kendall.

His radical approach could see Labour vowing to scrap Trident nuclear weapons and introducing a £10-an-hour minimum wage.