In Southern Europe it is normal to have 30-40degC in the summer, so I can't see what the fuss is about. I guess a bunch of jobworths who are having a day off from H&S, outreach working or counting how many portions of fruit and veg you have a day and have decided to tell us what is best with our current weather to justify their unjustifiable jobs.
In May when I was in the Ukraine in was 30-34degC virtually every day, but that did not stop me building a bathroom and porch extension, just put on suntan cream for the hottest part of the day and drank plenty of water. After a few days of hard work and plenty of vitamin D production I felt much better than I had in months after last years summer washout and our prolonged cold winter.
On Thursday I was in London for a meeting and rather than get a taxi or the tube, I have very enjoyable 1.5 mile walk from Waterloo station along the Southbank enjoying the views, especially all the women in their summer finary.

There was a free bar at the meeting / presentation, which worked very well in quenching my thirst from the brisk walk, followed by a wine tasting session.

I then went and had a curry with the person that invited me and then walked back to Waterloo station, this along with walking to my local station, walking for our branch line station Farnborough North to Farnborough main line station meant I walked about 7 miles all in all. It might have been 32degC but what is the problem, natures cooling mechanism is that you sweat.