Inside the Factory: Buses

Gregg Wallace goes behind the scenes at a factory in Scarborough, North Yorkshire, where London's famous red double-decker buses are built, finding out what goes into making the electric model. Cherry Healey visits a factory where she gets to grips with the construction of tough laminated heated windscreens for buses, while historian Ruth Goodman learns about London's earliest double deckers and the vital role they played in the First World War