Few among us could move seamlessly from balancing on a single vertiginous Jimmy Choo stiletto in a silver mini-dress with a kitchen whisk in hand to strapping on steel toe-capped boots and heading out on patrol with the police. But flitting between a glamorous photoshoot and a gritty shift on the beat is all in a day’s work for Mrs Rod Stewart – with no fuss, no nonsense and certainly no pretension. As soon as today’s photoshoot finishes, Penny Lancaster is packing her heels and her silk Dolce & Gabbana evening gowns into a suit carrier and swishing out of the dressing room, trailing her wheelie suitcase packed with her pressed police uniform behind her.