Picture of innocence - Telegraph A red-lipsticked woman wearing a white slip poses in a bedroom, glass of champagne in hand, with what might be taken for a saucy look in her eye. Behind her, on an unmade four-poster bed, lies a man, fully clothed except for his bare feet, which are crossed. He cradles his head in one hand and rests the other on his stomach. He is asleep. Beside him is a red attaché case, closed, on top of which lies a single sheet of paper. A pair of golden women's shoes lie on a seat at the foot of the bed. P D James could spin a short story from this scene; E L James an entire novel. But the mystery is swiftly explained. The man is the Prime Minister, David Cameron, and the woman is his wife's half-sister, Alice. She is preparing for her wedding - and so is he, in his way, having just returned from the rigours of the G20 summit hosted by Vladimir Putin in St Petersburg earlier this month. In a week in which the dark arts of politicians and their aides are once again being pored over, we might feel suspicion about this photograph - its composition and why we are allowed to see it. But we know that Mr Cameron is a family man and we know that he has the ability to relax when his body tells him to. It speaks well of him that the women around him are so comfortable in his presence that he can take a nap on a bride's bed. In one snap, he has shown us how to practise the much preached-about work/life balance.