Leonard Burt was a Dorset Constabulary policeman whose groundwork led to the arrest of five members of the Portland Spy Ring in 1961. During the autumn of 1959 the Detective Officer became aware of Harry Houghton, a Portland Naval Base clerk whose lifestyle and excessive drinking were incompatible with his clerk’s salary. Burt found it quite incredible that this man, who had been sent back from Poland because of his excessive drinking and black market activities, had been posted to the Portland Underwater Establishment. Here, some of Britain’s most secret submarine defence activities were carried out. Houghton had been involved in selling penicillin, a drug which was in short supply in Poland. He also frequently boasted about his invitations to attend parties at the Polish Embassy where he met up with old Polish friends. Burt’s discreet observations led to him finding that Houghton spent many evenings drinking heavily in the Elm Tree public house, Langton Herring. He would then make hi...