Correct me if I'm wrong but I beleive you live in the UK.Not always, personally speaking I'm doing everything possible too keep my girls cool. I have four shady covers for them and another being built.
I can't arrange electricity in position of my garden which is daunting. But I go about all day taking out cool water and various cold fruit. In the winter I add warmed pads underneath their straw.
Excessive temperatures are not something we (I'm in the UK now) suffer from.
I'm begining forget what the sun looks like!