Simon Lack in Cone of Silence

Simon Lack had a couple of scenes, for about 5 minutes worth of screen time, in Cone of Silence (aka Trouble in the Sky) (1960).

Bernard Lee plays a pilot who, at the beginning of the film, is reprimanded for bad judgement in a crash that allowed his co-pilot to die. In actual fact, the plane has design flaws, and when it's really hot (as happens in India where the film takes place) the take-off characteristics change for the plane. But Bernard Lee, who does everything by the book (and there's an actual book - a manual he checks) ends up being killed in another crash - presumably with the rest of his crew, including poor Simon Lack!) when the book gives him the wrong info for his next takeoff.

In Simon's first scene (in the creits he's just called "Navigator" but in the film he is called Taylor), he is figuring various kinds of calculations for the plane. While Bernard Lee doublechecks them, Simon gets in a wink at the co-pilot, and in the end of the scene when Lee tells him he's right, he has a nice little comic, "Thank you sir."

Then he's got a few seconds in the next scene, where everyone is in the cockpit, and he shares some new calculations with pilot Lee. Then they start their takeoff run, it's evident they're not going to be able to lift off, and they crash - but we don't see Simon's expression at this point.

Also in the film is a slim and trim, fiftyish George Sanders, and a slimmer and trimmer and fortyish Peter Cushing. An actor named Michael Craig is the star of the film, helping Bernard Lee's daughter clear his name.

I'll be uploading screencaps of those actors shortly.