Although not an enforceable law, Government guidance suggests an indoor workplace should be no colder than 16ºC or 13ºC if employees are doing physical work. However there is no guidance on maximum temperatures. I guess no guidance exists for maximum temps as it's only in recent years it's become an issue.
I set, program and operate CNC Brakepresses. One of jobs is for a customer who makes temporary football ground stands. (We did all the steelwork for Salford Citys ground). Each treadplate is 100kg and measures 2400mm x 1200mm, two folds per part, which involves lifting it off a pallet, onto a barrow, lifting into the machine, turning it over and then doing another fold the opposite direction to make a "z" shape. Then lift it off again.
Its a 2 man job, its ****ing heavy and dirty work. Doing that job in winter isn't an issue as you're hot and tired from lifting all day so minimum temperature shouldn't really apply..
Trouble is that all football clubs want this work done in off season (summer).
I have just finished my 8th litre of water and yet to have a piss today.
Im literally soaked through