Per the verbal exchange between Myrna and Frank: If Christopher Walken were 30 years younger he would still be twice the age of Eleanor Tomlinson.
Christopher Walken got involved because he is a fan of Stephen Merchant. He found the scripts to be really funny and liked the idea of playing a nice guy who had strayed. He also got to really like the city of Bristol where the series was filmed.
Originally entitled "The Offenders", it was renamed "The Outlaws" during production.
Darren Boyd and Jessica Gunning both appeared in Fortitude (2015).