I glanced at my watch as I strode out of the Tube station and through the drizzle into the emerging daylight. The time was one minute before sunrise – but would the clouds cooperate? I was heading once again for Primrose Hill, a popular site for viewing the sun rise over London’s cityscape, which I’d first visited on the winter solstice. This was my fifth visit in four weeks, and I was determined to capture a particular scene, a particular moment, that I’d forecasted one month ago. To get the shot, the sun would need to actually show up, and in rainy London that’s never certain. At home in the pre-dawn darkness, it was raining hard and the forecast was gloomy. I need to make a go/no-go decision 45 minutes before sunrise to reach to Primrose Hill on time. It’s always a gamble. Today I gambled and won.

