If Margot Fonteyn and Rudy Nureyev were the most massively important people who ever existed in ballet, then the most massively important question that ever existed in ballet was, did they sleep together? Last night Margot got this over pleasingly quickly. There was the quivery BBC anno at the start that there would be scenes “of a sexual nature”, and hop-skip-jump the couple were at it like rabbits straight after their first performance together.

Anne-Marie Duff doesn't really resemble Margot Fonteyn. Blonde, fresh-faced and blue-eyed, she has nothing of the exotic, olive, Latin complexion that Fonteyn inherited from her Brazilian grandfather. And she never learned ballet, even if, with her long, lean frame and elegant swan neck, she looks more like a dancer than the rather more compact Peggy Hookham of Reigate (as Fonteyn started out in life).

The phenomenal French ballerina Sylvie Guillem (b. 1965) has always been a modern woman, for all her classical ballerina dress. She joined the Royal Ballet in 1989 from Nureyev's Paris Opera Ballet, on terms of strictest independence, hardly saying a word to the press, while her image as a brilliant but truculent "Mademoiselle Non" grew and grew. The image belies the person, though - once you meet her, what’s striking is her lack of side, unblinkered intelligence and polite but firm candour.