I am looking for the name of a movie I am guessing was released in the 1950’s or 1960’s. WW2 time period. Took place in England or Scotland. All I remember is a country house located on water with access to the ocean. A Nazi spy is discovered and is set to be picked up by a Nazi submarine. The stipulation was that if the spy did not arrive at the pickup point at the exact time, the submarine would leave without him. And it did.