The well-prepared adult accompanying an under-10 to the Royal Ballet’s Tales of Beatrix Potter will take with them a pillow and a potty, the pillow for themselves, the potty to tuck under the seat for the necessary moment during this 70-minute marathon. Should the Stasi at Bag Search at the Opera House entrance insist on the potty being checked into the cloakroom, the canny adult carries a supersized handkerchief as backup, to stuff into the child’s wailing mouth when - 30 minutes in, with infant acuity - it realises that it has seen the best bits and there are another 40 minutes of these capering costumes to go, while all the adult wants is a bit of shut-eye until the thing is all over and they can get on with Christmas.

The spy out in the cold, the alienated Heathcliff of ballet, rough-hewn, moody and a little frightening - this is an image that’s commonly paraded of the choreographer Kenneth MacMillan. His ballets stand up that image, staging barely watchable sexual urges (The Judas Tree, My Brother, My Sisters), accusing polite society as a force for evil (Mayerling, Las Hermanas), smashing the porcelain in ballet’s china cupboard.

It‘s when you see how popstar fame can reach people with more luck than work that Carlos Acosta’s achievement in becoming a truly popular ballet star is underlined. Ballet is just the toughest discipline there is. Great elite artists and great popular artists are generally divided by an insuperable wall; often there’s a sell-out of some kind when the great elite artist achieves wider popularity, the dancer gets cocky or vulgar or goes on too long. But I have to exempt Acosta from that.

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.

Peter Wright’s superlative production of The Nutcracker has returned to Birmingham Royal Ballet's repertory for Christmas, a production he created for the company in 1990 and to my mind superior to any other presented in the UK today. Magic, the awesomeness of the Tchaikovsky score, are realised upon the stage and shown in its dances with a childlike sense of fantasy. The Christmas tree rises, the rats play, the snow-goose flies - and the audience gasps.

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).

Christmas ballet would be unthinkable without The Nutcracker. But what kind of Christmas should it be? This year the UK fields an astonishing array of visions, from Biedermeier formality at the Royal Ballet, to Fanny and Alexander romanticism at Birmingham Royal Ballet, Elvis cartoons at English National Ballet, and expressionist German psychodrama at Scottish Ballet.

Is the look to be Beckmann, Bergman or Nicky Haslam? To accompany the interviews with Nutcracker designers elsewhere, here are three very different design portfolios tackling the eternal magic of this favourite ballet with unexpected reference points. Sketches by John F Macfarlane for Birmingham Royal Ballet, Antony McDonald for Scottish Ballet and Gerald Scarfe for English National Ballet are seen with production stills alongside.

Lush, romantic storyballets are as scarce as hens' teeth these days, despite the longing of much of the ballet audience to see them. Not because they're too elementary for today's dancemakers, I'd guess, but because to make one with lively dancing characters (male, female, young, old, good, bad, rich, poor), with a flowing story, lashings of set opportunities and an atmospheric score, takes multiple theatre skills few choreographers now develop. David Bintley's Cyrano is one of these rare birds, a truly skilled family ballet with all of the above.

As a new biography of the Royal Ballet's great choreographer Sir Kenneth MacMillan by Jann Parry reveals, MacMillan's ballets are often about characters in shadowy explorations of inner states of mind. In part, his willingness to portray loneliness, sexual jealousy, greediness and violent assault in a medium usually associated with escapism and pretty fairy-tales accounts for both the attraction felt for his major ballets worldwide and also the hostility with which his efforts were greeted inside the Royal Opera House.