Photograph: Getty Images

It’s that time of year when the sun slacks. Clocking in late, clocking off early. The sun’s out there having an affair with the other side of the world and the UK is plunged into darkness and depression at 4pm. You start reading in the early afternoon, get to the end of a chapter and realise you can barely see the pages. You idly check the weather app and discover there are precisely seven minutes to get your walk in before the sun sets and the hum of the street lights starts. You basically live in a cave.