“What are you ashamed of in Britain today?” asks tweedy TV commentator Dirk Bogarde, interviewing the average man-on-the-street. Well, for starters . . . John Schlesinger’s bitter, stylish answer is framed as the autobiography of Diana (Julie Christie), a media darling telling/selling “My Story” to Ideal Woman magazine. Her blandly self-justifying narration is undercut by the images as she leaves an unglamorous marriage for liaisons with Bogarde, representative of a BBC-bookish world; oily adman Laurence Harvey; and finally an Italian principe, with stops along the way for hypocritical upper-crust fundraisers, exploitation films, Parisian art parties, an abortion, and a spot of shoplifting at Fortnum & Mason’s. Tracing Diana’s progress from lowly bra model to “Happiness Girl” to the ultimate emptiness as Princess Diana, Schlesinger offers a critique of a striving consumer society in the form of a critique of a woman. Bogarde, in summary: “You’re a whore, baby.”