Do you mean Police Constable Archibald Berkeley-Willoughby – radio programme starring Brian Reece and Joy Shelton ? – I remember it well (old git!)

http://www.whirligig-tv.co.uk/radio/pc49.htm

Hmmm… I can see that yours is “a” PC49, but I’m not convinced it is “the” PC49 from my childhood, being considerably younger than yow! 😀