Sylvie Guillem is retiring in exactly the same way as she does everything: in her own time and on her own terms. She turns 50 this year, but it’s not that age is finally catching up with her – at least, not in her body, which she acknowledges has potentially many more years of dancing in it.

The twelve days of Christmas may be over, but I have good news for ballet fans in London: a whole new batch of presents for you has washed up at the Coliseum, and it's overflowing with lords-a-leaping, ladies dancing, and swans-a-swimming.

Unusually, English National Ballet’s Nutcracker finds itself in an empty field this year. Three Decembers ago, the second time out for Wayne Eagling’s production, it had to contend with Matthew Bourne’s version and the Royal Ballet’s, not to mention the fallout from a BBC fly-on-the-wall series that had brutally exposed its difficult conception.

There is a special poignancy to these performances of Sacred Monsters, Sylvie Guillem and Akram Khan's terrific 2006 joint show.

The ballerina claque wars that generally accompany visits here by the Mariinsky Ballet are raging particularly feverishly this year, but it all falls silent when Uliana Lopatkina makes one of her increasingly rare appearances. So much noise is focused on legginess or hip flexibility of these size-zero ballerinas, and yet the Mariinsky knows more than any other company in history that it is not body but mind that matters in the final analysis. Their luminous historical legend Galina Ulanova was nothing to look at physically, until she started dancing.

Mounting a contemporary dance show together doesn’t seem like the best way to get over your ex, even if you are (or rather, were) ballet’s most fabulously marketable couple.

Last night’s performance of PUSH at the London Colisem left me exhilarated and downcast in equal measure. Exhilarated because dancer Sylvie Guillem, dancer/choreographer Russell Maliphant and lighting genius Michael Hulls together create the Holy Grail of dance, a blend of intelligence, talent and charisma so stunning and convincing that it seems to trascend description and become sacramental. And downcast because this run is the last of PUSH in London, and so for most of us the last time we’ll ever see it, or perhaps even see Guillem or Maliphant perform.

If you’ve reached the top of your profession and then spent twenty years there, retiring is going to be hard. It will be many times harder if, like New York City Ballet principal Wendy Whelan, you were only twenty-four when you reached that rank, and only in your mid-forties when injuries came calling and roles started to fall away - unwelcome signs that the end of a classical ballet career is nigh.

What a difference a change of cast can make to a show. On Wednesday night I saw Tamara Rojo and Carlos Acosta as the titular lovers in English National Ballet’s Romeo and Juliet at the Royal Albert Hall (see below for that review). Last night it was the turn of ENB’s other Royal Ballet emigrée, Alina Cojocaru, and guest star Friedemann Vogel of Stuttgart Ballet.

When Sylvie Guillem became, at 19, the youngest person ever to reach the top rank of the Paris Opéra, she gained a job title – étoile (star) – that uncannily captured her essence. Most companies call their top dancers principal or prima ballerina or soloist, titles that show they have first place among their peers. Sylvie too stands out among her peers, blessed as she is with an extraordinary body, an extraordinary work ethic, an extraordinary intelligence.