Cameras follow 24 hours of life on the factory floor at the famous McVitie's factory in Carlisle, documenting the work of the staff making some of the nation's favourite biscuits. The programme follows the whole production line process, from mixing the dough and baking the biscuits, to the engineering teams keeping the machines running, and staff offer first-hand accounts of life working in the oldest biscuit factory in the world. Plus, Food historian Dr Polly Russell reveals the history of the factory.