A pilot comprising three stories which would become episodes of the TV series 'Colonel March of Scotland Yard', filmed in the Autumn of 1952 at Nettlefold Studios: "Hot Money (1956)," "Death in the Dressing Room (1956)," and "The New Invisible Man (1956)."
Although Cy Endfield is credited as director for the film, when all the three stories that form the basis for this pilot, were shown as episodes in the USA, they list Donald Ginsberg as director due to Endfield being blacklisted.
Besides this film, there is also a TV series Colonel March of Scotland Yard from 1954-1956, also with Boris Karloff.
Shot in 1952, this was a back-door pilot for a future television series to be filmed in the UK. Interest was slow at first as the BBC (then the UK's only television broadcaster) showed no interest and in the US none of the TV networks there were interested as there were only three episodes completed at the time and they wanted a lot more if they were to buy it. Eventually the three short stories were edited together into a feature film which was released in 1953, a year after they were filmed. The film did reasonably well and when producer Hannah Weinstein became aware that permission for a commercial based TV service in the UK was going to be granted in 1954 with a view to start broadcasting in 1955, she pushed ahead with production of 26 episodes with funding provided by impresario (and future media mogul Lew Grade). Filming was completed by late summer 1954 meaning that by the time commercial television was ready to start transmission in September 1955, she had 26 hours of British made drama ready. The series sold in both the UK and US (where it had actually started showing in December 1954)
Watch out for future 'Carry On' star Joan Sims in one of the stories. She was only 23 when she appeared in this.