This is one of about three dozen British films picked up by CBS in 1949 for USA television presentation; its initial telecast took place in New York City Friday 25 March 1949 on WCBS (Channel 2). Since it had never been shown theatrically in the USA, this was also its USA premiere. In Los Angeles it was first telecast Monday 21 November 1949 on KLAC (Channel 13), and in Boston Sunday 22 January 1950 on WNAC (Channel 7).
Coincidentally the car with which the Nazi agent runs over the policeman is an "SS" Jaguar.