Michael Redgrave, in order to disguise their real conversation from a passerby (the fake Miss Froy), says to
Margaret Lockwood, "Of course, for sheer variety, give me an English summer. I remember once spending a bank holiday in Brighton..." This alludes to the film
Bank Holiday (1938) released earlier that year by the same studio, starring Margaret Lockwood, and set largely in Brighton. A bank holiday is what North Americans would call a long weekend.