Based on a popular BBC radio series. Eric Phillips is the only actor to re-create his radio role, however Brian Reece and Joy Shelton took over their roles for the sequel.
Archibald Berkeley-Willoughby is a uniformed officer - PC 49 - attached to 'S' Division.
The police rota glimpsed after 49 joins the case on 'Other Duties' is dated [Sunday] 16th January 1949.