Guest Stars Joel Dommett as Himself Chris O'Dowd as Sir Barnes Wallis Joe Wilkinson as Dr. Doctor Bliss Alexander Armstrong as Sir Arthur Harris Brett Goldstein as James Garfield Theo Barklem-Biggs as Guy Gibson Joe Thomas as Alexander Graham Bell Brian Quinn as Himself Sal Vulcano as Himself Samson Kayo as Bill Matthew Steer as Charles Guiteau Bruce MacKinnon as Charles Sumner Tainter Tom Bennett as A.R. 'Dick' Collins Richard Glover as Railway Employee Lucy Middleditch as Librarian
