I've learned two crucial lessons so far this summer: firstly, repeated, sustained heatwaves call for tweaks to your usual workout routine (it's no good just waiting for it to cool down anymore, let's face it) and secondly, wherever you're exercising, make sure there's a water source close by.
How did I come to these less than radical conclusions, you ask? Well, it's safe to say that unsuccessfully attempting to stick to my usual twice-weekly running regime mid-heatwave was the catalyst for much-needed change.