Those saying "well they cope in hot countries" - yes BECAUSE
They're acclimatised to it
Building design is adjusted for it inc air con
Town design is different too - broader streets, more trees, green space etc
Working conditions are adjusted - hours when places are open, employees able to hydrate frequently, take breaks at hottest points, uniforms are designed for the climate.
So it's not as simple as just laughing at us for not coping.
It's also a different quality of heat. It tends to be much more humid here than eg Spain.
Transport - many issues there not just relating to heat but overcrowding which is always uncomfortable - I think there needs to be better regulation here.
Surely the idea isn't necessarily to send everyone home but to make employers provide cooler working environments and conditions which make it easier/less damaging to health to work in hot temperatures.