They say: “From April 26 to May 6, London becomes a vibrant backdrop for iStockphoto photographers from around the world to practice their art en masse. iStockers will show off their talents at iStockphoto’s exclusive shooting event, the London iStockalypse, and the World Photography Festival, of which iStockphoto is a major sponsor and participant. Sharing experiences and expertise, iStockers will demonstrate the beauty and power of their six million-strong community”.