Anton Chekhov formulated the principle that there should be no extraneous elements in a dramatic presentation: That if you show the audience a gun in the first act, it ought to be fired before the end of the show.
I’ve been watching a lot of B-level British comedies of the Sixties lately, and I’ve formulated a similar principle. Many of the movies I’ve been watching star actress Liz Fraser, a big-eyed blonde with a va-va-voom figure. My new principle, which I’m calling "Chekhov’s Liz Fraser", states that if Liz Fraser appears in the first act of a movie, she’s going to appear in a state of partial undress before the movie ends.
I can’t be bothered to double-check but I’m reasonably certain Liz Fraser kept her kit on in I’m All Right Jack.
As she did - though you could be forgiven for not knowing this - in the episode of Last of the Summer Wine (aka the Elderly Actors’ Supplementary Pension Fund) where she turned up at Compo’s funeral as his Thursday afternoon interest.