Framestore’s own directors Chris Waitt and Henry Trotter (A Complete History of My Sexual Failures, Fur TV and J-Factory) wrote the stories and directed the series, while Joel Morris and Jason Hazeley (Ten O’Clock Live, That Mitchell and Webb Look, The Armstrong and Miller Show) contributed to the stories and scripts.

Once the basic characters had been mapped out, dialogue was laid down through voice recording sessions, with the directors encouraging Armstrong and the drivers to improvise and play off against each other.

Source: Framestore