Hans Werner Henze, the composer who died on Saturday aged 86, wrote the music for one of Margot Fonteyn's signature ballets, Ondine, a ballet about an inhuman spirit who longs to be joined to a man - but when she does, he must die. It might almost be a metaphor for the death of the thought the moment it is realised.

Birmingham Royal Ballet’s second triple bill at Sadler’s Wells this week is aptly titled "Autumn Celebration", acknowledging the season’s diverse weather through eclectic, light-hearted programming.

A birthday offering, a wedding celebration - with that, and one further creative collaboration ahead, Dame Monica Mason makes her farewell as director of the Royal Ballet after 10 years. The last programme of favourites from the store cupboard must always be a tricky one, but true to form the mistress of the great occasion (anniversaries have been a mainstay of her programming) picked rituals and ceremonies that stressed company ethos and values.

World premieres, new faces, lower ticket prices (and the first recycled opera production). The Royal Opera House announced a bullish attitude today as it enters the austerity post-Olympics period for next season with six ballet  premieres and six new opera productions. Ballet headlines are that the leading Russian choreographer of the era, Alexei Ratmansky, will create a work for the Royal Ballet - as will Christopher Wheeldon. Radical abstractionist Wayne McGregor will create his first narrative ballet, and the rising young Liam Scarlett will create his first full-length ballet.

There must be a protest movement going on in Birmingham’s ballet against London’s - if down south they insist on Kenneth MacMillan’s box-office blasters, so in the Midlands it’s Frederick Ashton’s more fragile work that reigns. BRB director David Bintley’s northern chip on the shoulder has its uses, and especially this spring. After his hugely entertaining Hobson’s Choice last week, here is a double bill of Antiques Roadshow Ashton that it's unlikely today's Royal Ballet (trying so consciously to be hip) would think of rediscovering.

It may be that there is no sunnier place than Ashton’s La fille mal gardée. Certainly there is no sunnier ballet. It speaks not of great drama, nor ecstasy, but instead of gentle happiness, of quiet content and loving kindness. Not, one might think, the stuff of great art. But one would be – one is – wrong, and Ashton is happy to set us straight.

The cool physical activity of McGregor’s Limen, the crimson passions of Ashton’s Marguerite and Armand, the symbolic sculpture of MacMillan’s Requiem - the weekend's new triple bill at Covent Garden shows three faces of British ballet-making over the past half-century. While none is the masterpiece of its creator, together they describe an arc over time where lyrical emotion became replaced by gymnastic motion, compression by diffusion, individual idiosyncrasy by a kind of balletic collective.

Death concentrates the mind wonderfully, as they say. In the wake of the demise last week of Alexander Grant, who owned the choreographer Frederick Ashton's world-wide hit ballet La fille mal gardée, the Royal Ballet has announced that it is launching a foundation to "perpetuate the legacy and work" of the distinguished choreographer 23 years after his death.

You hear the names of the princes and romantic heroines in ballet, but the global success of 20th-century British ballet had much to do with its dramatic acuity and nuancing, the unexpected side characters who in the ballets of Ashton and MacMillan were vastly more interesting than the stock supporting roles of 19th-century ballet. Alexander Grant was the key man in the growth of sophistication in British ballet in the Forties and Fifties, a character performer of powerful personality, and a performer who could out-dance almost any leading man.

Like planets crossing in the skies, light years apart, but by some ocular illusion coinciding, this conjunction of the two most thrilling young Bolshoi stars in the world and Frederick Ashton’s rarely staged Romeo and Juliet really must be seen. Natalia Osipova and Ivan Vasiliev are real-life lovers as well as phenomenal work colleagues and passionate actors. The freshness of youth, the unhindered outpouring of emotion, the finish of their dancing, and their direct stage personalities enrich to bursting a chamber-sized telling of the tragedy that's refreshingly intimate by comparison with the more popular blockbuster versions.