The filming location is not Stevenage, but Crawley, West Sussex.
First released as second features in Great Britain. 'The Scales of Justice (1962)' film series was then repackaged as a TV series for export.
The new town railway station is Crawley, West Sussex. The platform sign shows north bound destination to London Victoria station.
BRITISH BOARD of FILM CENSORS: This is to Certify that "Undesirable Neighbour" (not The Undesirable Neighbour) has been Passed as more suitable for Exhibition to Adult Audiences 'A'.
The first of three appearances by Kenneth Benda, the others being in E1 E6, The Invisible Asset (1963) and S1 E11, The Haunted Man (1966).