My goal was to take a picture in London with an intense sense of place, and I knew that to do this and remain original was a formidable challenge. There are few cities in the world more photographed than London, and to tell a story that would resonate with a content-spoilt audience, we had to be at our very best. There is nothing more disappointing than to creatively underwhelm, particularly in my home city. My instinct was to go back in time and play to the lore of the gritty post-war London of the 1920s. The historic dockyards of Chatham offer a strong visual canvas on which to tell stories, and I sensed that if we played with the ambient light of the early evening and married that with old London streetlights, we had a platform to build on. The Roaring Twenties in the UK are remembered as a decade when women found equality and their sexuality was celebrated. It was an era where grit and glamour forged an unlikely alchemy. Choosing British supermodel and actress Cara Delevingne, a quintessential London girl, as my lead was one of the easier decisions of my career. Meanwhile, David Gandy is my favourite male lead to work with – he always nails it.