The primary school teacher taking her class on a visit to the alien zone checkpoint is played by actress/playwright/stand-up comedian Vivienne Acheampong. Vivienne worked as a primary school teacher for more than a decade before moving into the entertainment business. Her surname is incorrectly spelled Achaempong in the end credits.
A number of vehicles used during filming have had the manufacturers badge and other identifying details deliberately removed. Whilst this adds to the air of run-down, lawlessness in the alien ghetto of "Troy" it is also to conceal the fact that these vehicles are badged as Opel vehicles in Bulgaria (where location filming took place). The series is set in the UK, where these Opel vehicles would bear the badge of the Vauxhall marque.