Ralph Richardson is a well-known herpetologist among people who know who's who in herpetology. He's also an electronics engineer and attached to the unit developing radar for the RAF.
You could put Ralph Richardson in anything, and I would praise it to the skies. Saying he's perfectly cast as the understated boffin who tackles whatever is thrown at him in a self-deprecating manner, whether it's turning down an opportunity to join the Home Guard because he's too busy or parachuting into German territory to take apart a prototype of the German efforts at radar, he's always highy watchable and believable. In this movie, he's got quite a cast with him under the scripting and direction of Peter Ustinov: John Laurie, Finlay Currie and Raymond Huntley among the boffins, David Tomlinson and Richard Attenborough among the fliers. Ann Wilton and Peggy Evans are among the women who get a few lines, but it's a bit of "men must fight and women must weep" movie for them. Still, even Finlay Currie barely seems in the movie, when compared with Richardson, which is all right with me.