The classic TV organisation joined forces with the Tim Disney Archive to buy the 16mm print of the episode, Tea or Coffin, from a collector on internet auction site eBay.
The recovered show, broadcast by the BBC on February 26, 1968, is said to be in “superb” condition and is now the only episode that remains from the six-part series — a sequel to the popular Hugh and I sitcom, which ran from 1962 – 67.
It will be shown at the BFI’s Missing Believed Wiped event later this year.
In Hugh and I Spy, written by John Chapman and produced by David Croft, Terry and Hugh found themselves unwillingly involved in espionage and double-dealing.
As befitting the spy genre, each episode ended in a cliffhanger.
Tea or Coffin was the final episode of Hugh and I Spy and starred Fred Emney and Rex Garner (series regulars) plus Derek Sydney, Robert Gillespie, Jasmina Hamzavi, Francisca Tu, David Toguri, Roger Carey, Julie Mendez, Dino Shafeek, Rafiq Anwar, Paul Anil and John Louis Mansi.