Special Branch: Love From Doris | Fulton Mackay, Derren Nesbitt, Georgina Hale (1970)

When military security intercepts a letter written to a lonely serviceman by his foreign 'penpal' Rita, which contains casual references to secret information, Supt Inman sends DCI Jordan to investigate. Series playlist:    • Special Branch | Derren Nesbitt, Keith Was...   Broadcast 7th October 1970