When Sainsbury’s wanted to extend the reach of its Christmas TV ad, it turned to the digital marketing agency AnalogFolk. The firm specialises in creating digital “experiences”, including mobile and web apps, and it says its video-based social media campaign for the supermarket reached 22m people. Bill Brock, 41, and Matt Dyke, 40, set up the business in 2008 and now have offices in Australia, the US and Hong Kong. Buoyed by the arrival of new clients — including Lucozade and Sony PlayStation — sales increased to £16m in 2015.