I saw the film on late-night TV some forty years ago. From what I can remember, the plot and acting was so-so - a typical east-west "semi-noir" spy melodrama. What caught my eye, though, was where it was filmed. The location work was photographed in Uxbridge, a smallish town on the western edge of London's conurbation. It suffered the fate that many such towns did in the 1960s and 70s: buildings built in the 15th to 18th centuries swept away in a concrete make-over of its centre - Preston among them! The film however captured some good images of the southern part of the town centre a year or two before this municipal vandalism took place. Could this film be a useful addition to the town's architectural history?