The threat of nuclear war appeared in many films in the Fifties and Sixties, perhaps beginning with Seven Days Till Noon (1950). An unsual take on this is Nigel Kneale's The Crunch (1963), whose fifty minutes turn around a former colony's embassy threatening to detonate the bomb which has been created in its London basement.
England has a sober Prime Minister while the colony has a beserk President who is kept in check, almost, by an Ambassador.
Preposterous, but, as usually ther case with Kneale's work, one is carred along. Here is a corner of a deserted London with car horns parping throughout offscreen while the Prime Minister sits it out with the Army and Police while tanks are to the ready (although one is left to wonder what these could do).
Dark-hued, dense, it is involving - even if a late turn remains puzzlingly fantastic -, and leaves one eager for the later films on this disc. One of them at a time feels best.