Chris Christodoulou has been photographing conductors at the BBC Proms since 1981. Many attending the Proms at the Royal Albert Hall may well have attempted to spot him. They can give up on that game herewith. As he explains to theartsdesk, the venue with its many curtains and nooks allows him to work discreetly. (If you want to know what he looks like, see below right.) We have been featuring Chris’s pictures in an annual gallery since 2010. This year we have asked him what makes a good picture of a conductor, and how he goes about securing it.

Sir Simon Rattle (b. 1955) and the Orchestra of the Age of Enlightenment (est. 1986) have been together from the beginning. Founded by period-instrument musicians eager to run their own affairs rather than play obediently for conductor-managers like Christopher Hogwood and John Eliot Gardiner, the OAE invited Rattle to conduct a concert performance of Idomeneo in that first year.

The BBC Proms are steeped in traditions, many admirable, some arcane, the odd one ever so slightly maddening. In the short life of The Arts Desk - we turned three on Sunday, the day after the 2012 Proms season came to a close - another tradition has come into being. Every year we publish a gallery of portraits of conductors at work. These astonishing photographs are all by Chris Christodoulou, who has been capturing the Proms in pictures for 31 years.

During an orchestral rehearsal, it’s tense in a TV scanner at the best of times. A scanner is one of the huge vans parked outside the Royal Albert Hall with a wall of screens showing the shots from the cameras within. There’s a large huddle of BBC radio and television vans for the whole season. But there was another outside broadcast encampment on Saturday for the Last Night of the Proms, which was being broadcast in 3D for the first time.

The BBC Symphony Chorus did a mass Mobot. A posse of medal-winning rowers and sailors led the encore of Rule, Britannia. The Maltese tenor Joseph Calleja entered in Team GB trackies. It has been, we can probably agree, a summer unlike others we have known. Every year the Last Night of the Proms celebrates Britishness as if we’ve won a stack of golds and wowed the world, when mostly – these no longer being the 1890s - we haven’t. But for obvious reasons last night’s Last Night had the chance to put clear blue water between itself and the regular warm bath for jingoists.

The Vienna Philharmonic Orchestra can play Haydn’s last symphony - No 104 “London” - in its sleep but that is not, I hasten to add, the impression one wants to take away from any performance of it and especially not in the city that inspired it. The music tells us that Haydn had a rather better time in our capital than Bernard Haitink would have us believe but this rather dogged account on the penultimate night of the Prom season seemed to suppress the work’s genial good humour and pre-empt most of its surprises with a one-size-fits-all approach.

You’ve never seen so many people at a Prom, thousands of them packed into every space of the Albert Hall inside, while outside a 100-metre line of hopefuls queued in vain to stand in a pit where a small cat couldn’t have been added. But then this was a luxury Prom: with the Vienna Philharmonic and two musicians of golden integrity and sensitivity, lifetime members of the high table, the pianist Murray Perahia and the conductor Bernard Haitink playing two works born in Vienna.

I'd love to see the stats on the last time a Prom was this packed for an afternoon organ recital. Were it not for the fact that organist Cameron Carpenter was sporting spandex trousers encrusted in silver glitter, a wife beater and Mohawk, you could have been mistaken for thinking we were back in the organ glory days of the early 19th century. Even the programme harked backward, offering as it did big, bloated Romantic transcriptions, arrangements and improvisations (pretty much everything in fact except the urtext).

Champagne on ice in the private boxes; scarcely any spare seats. This isn’t the normal situation for a concert climaxing in Witold Lutosławski’s Third Symphony, a modernist work whose usual audience is more than two men and a dog but still doesn’t pull in the crowds.

It's not completely unheard of what Sir Simon Rattle did at the start of last night's Prom, where he elided two familiar works - Ligeti's colouristic classic Atmosphères and the Prelude to Act One of Wagner's Lohengrin - into a seamless whole, beating without stopping from one into the other. But it was still pretty breathtaking.