It’s not easy to know where to begin. I’ve tried writing this several times already, maybe because I’m not sure if I should be writing it at all. But I’ll start a couple of Sundays ago, when I decided to clear out the loft in my flat. I’d been putting it off for ages, partly because it’s one of those jobs that takes three times longer than you expect, and partly because I wasn’t sure what might be hidden under the dust. But on this particular Sunday I could find literally nothing else to do, so after wrestling with the folding ladder, I hauled myself into the dust and darkness…