It's here again, the entirely predictable annual health risk that we Britons seem powerless to do anything about - the summer heatwave. Like the occasional snowstorms that paralyse our roads and cities, or the devastating floods that poured so much misery on middle England in 2007, we often know that adverse weather is on the horizon but remain stoically unprepared. We still refuse to respect the vagaries of the weather, even though trying to predict it is a national obsession.
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