You may well ask whether theartsdesk hasn’t already exhausted all there is to say about Glyndebourne’s most celebrated Britten production of recent years. I gave it a more cautious welcome than most on its first airing, troubled a little by the literalism of Michael Grandage’s production and the defects in all three principal roles.

So for one last time this season the impossible colosseum of Albertopolis became the Wagnerian holiest of holies – to be precise, the Cathedral of the Holy Grail - and once again I fell in love with the beast transfigured. Justin Way, the one artist common to all seven Wagner operas as their subtle semi-stager, should be the delegate to receive the award the Proms deserve for highest achievement of bicentenary year; and it seemed right to have Sir John Tomlinson, albeit by dint of another bass’s indisposition, giving his benediction as the witness of a final miracle.

Reading through WH Auden’s libretto for Britten’s first stage work – the so-called operetta Paul Bunyan – it’s sometimes hard to decide whether the intention was to participate in the great American dream or to make fun of it. In 1941 both artists were living in the United States and writing for Americans, who famously didn’t take to the work’s blend of folksy condescension and sententious eloquence. The combination is still faintly queasy.

Jeremy Paxman’s beard may have been a wonder and a talking point for five days, but Michael Tippett’s opera The Midsummer Marriage beats it by almost 60 years. Ecstatic, visionary, energetic music, yes indeed. But, oh, the composer’s libretto! The Magic Flute, T. S.

When first seen at Serge Dorny’s Opéra de Lyon in March-April this year, American Gary Hill’s unusual vision of Beethoven’s Fidelio could be recognised immediately as concept opera: drama where a director’s “idea” largely takes over the story. Hill directs (up to a point), and conceived the mesmerising projections that dominated the stage (realised, with jaw-dropping skill, by his technical assistant).

It’s not a crowd-pleaser like Albert Herring, nor wittily fanciful like A Midsummer Night’s Dream or macabre like The Turn of the Screw and certainly not the classic that Peter Grimes has become, and until three years ago Glyndebourne had never even staged Britten’s Billy Budd. But Michael Grandage’s 2010 production was a sea-changer. Aided by Mark Elder in the pit, the director made his operatic debut with devastating simplicity, reminding us all of the power of this uneasy tragedy.

On the one occasion I went to Bayreuth, I made the mistake of seeing The Flying Dutchman and Lohengrin after the best of Ring cycles. At the Proms we’ve had a week of serious Wagnerian withdrawal symptoms, so Tannhäuser was never going to feel like too much or too little of a good thing. In any case, this always fascinating if dramatically primitive early clash of sex and religion is shot through with later passages composed in between work on the Ring, most of them included in last night's 1875 hybrid version.

And so Wotan’s ravens flew home and at the twilight’s last gleaming the immortals were consumed by fire and water. All was finally and irrevocably redeemed by the power of love, and the most beautiful of all the leitmotifs in Wagner’s Ring rolled out across the Albert Hall like a benediction. It was a defining moment in Proms history, no doubt, and was greeted with a few moments of perfect - and I mean perfect - silence.

Such has been the justifiable flow of superlatives this week about the Berlin Staatskapelle's Ring conducted by Barenboim, the centrepiece of the BBC Proms' Wagner bicentenary celebration, it would have been easy to forget that the 2013 Proms season contains not just those four, but seven complete Wagner operas.

The transformative power of the Royal Albert Hall at Proms-time never ceases to amaze me.