To mark the centenary of the 1918 influenza pandemic, the BBC have put together a feature-length documentary called ‘Contagion! The BBC Four Pandemic’. Central to the documentary is a nationwide citizen science experiment, during which volunteers in the United Kingdom could download and use a custom mobile phone app called BBC Pandemic, and contribute their movement and contact data for a day. This talk explores the modelling work that went into building influenza epidemic simulations for this program and some insights from this incredibly rich data set.