Ghost Squad

Certainly one of the unique things about 1960's television was the development, popularity and number of intrigue / spy shows. Danger Man, The Man From U.N.C.L.E., The Avengers, Mission: Impossible, The Champions, I Spy, Department S, The Saint, Callan, Special Branch, The Prisoner, Man In A Suitcase...to name a few. Ghost Squad was another. This one concerned an elite secret branch of Scotland Yard. It returned in 1964 for a third series but under the name of "G.S.5", but those episodes were either wiped or lost.
http://en.wikipedia.org/wiki/Ghost_Squad_%28TV_series%29