In keeping with the trends of recent years, the Edinburgh International Festival is showcasing a small but eclectic dance programme, light on classical ballet and heavy on contemporary, international and fusion. After choreographer Mark Baldwin’s collaboration with Ladysmith Black Mambazo last week, the festival is now playing host to what may be the final performances of Akram Khan’s bill Gnosis, which was a huge hit when it premiered at Sadler’s Wells in 2009.

It sure feels like longer than three weeks since the Mariinsky rolled into town – at least if you’re one of London’s ballet fans. Non-balletomanes might be wondering whether the feverish intensity with which the company’s doings are followed, its form analysed, its health diagnosed, is disproportionate, a case of collective hysteria stoked by cultural stereotypes about Russians and the absence of other ballet offerings in late summer.

This was the most eagerly anticipated programme of the Mariinsky visit - something old, something borrowed and something new. The old, that colourful fairytale of Stravinsky’s lush, melodious youth, The Firebird; the new, a recent acquisition by the Londoners’ favourite Russian, Alexei Ratmansky; and the borrowed, something from English ballet legend, Frederick Ashton’s Marguerite and Armand, once kept under glass with the Fonteyn and Nureyev myths, but eventually released from the museum by Sylvie Guillem and Nicolas Le Riche a decade ago.

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.

For a dance company, the always delicate balance between preserving your heritage and creating an exciting future becomes especially hard to negotiate when you are the most venerable institution in your field. The Mariinsky Ballet, now on tour in London, have this problem magnified by a general perception (theirs and the public’s) that they are the world’s keepers of the great Russian ballet tradition, which they are expected to represent at its finest.

School’s out for summer, even Parliament is on recess, and the streets around my house are suddenly devoid of children, as families make for the hills (or at least the beach). It should be dead season for all but prommers (and the suffering residents of Edinburgh) but ballet in London has had the most extraordinary week of first-class acts, with the Mariinsky at the Royal Opera House, Sylvie Guillem and Russell Maliphant at the Coliseum, and now the BalletBoyz’ 10-strong troupe The Talent at the Roundhouse in Camden.

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.

One of the reasons I always tell ballet sceptics to give Romeo and Juliet a go is that any production with halfway decent lovers and a vaguely competent rendition of Prokofiev’s score should convince them that this art form isn’t just about swans and sugar plums.

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.