Filming began in Birmingham, London and Wales in August 2013. Birmingham Central Library, since demolished but a notable example of Brutalist architecture, was used as both an interior and exterior location for the headquarters of MI5. Other locations include Birmingham Moor Street railway station, Warstone Lane Cemetery, Cannon Hill Park, the Old Rep, Grand Hotel, Moseley Road Baths, Methodist Central Hall, Merevale Hall, Lickey Hills, the canals in Smethwick, Newhall Street, and the Birmingham old Central Fire Station. Interior railway scenes were shot on the Ecclesbourne Valley Railway in Derbyshire.