Found at 50 Hertford Street in London's Mayfair, the Shepherds Tavern pub where Bradley and Parminter meet to converse is still standing and open for business, though has reverted to its former name from 1769 to 1938: The Chesterfield Arms.
First of three series appearances by Dennis Price as Brandon, the butler. Sadly, Price passed away less than a year after the series wrapped, dying at age 58 on October 6, 1973.
Guest star Angela Scoular (Dorinda) appeared in both the James Bond spoof Casino Royale (1967) and the canonical Bond film On Her Majesty's Secret Service (1969).
Earlier this same year Fiona Lewis (Clarissa) appeared in the cult classic horror film Dr. Phibes Rises Again (1972).