Handel’s audiences must have taken a very long time to settle – at least an act, to judge from the mostly inconsequential music of Alcina’s first hour. Lovely: we’re on an enchanted isle where puritanical people have been transformed into animal-headed courtiers, and a love-imbroglio merits only a “so what?” Richard Jones and his singers keep it lively and focused, but the bounce needed from Christian Curnyn and the Royal Opera House Orchestra doesn’t come.

In usual circumstances, a fully staged opera and every voice-and-piano song-cycle by a single genius in one weekend would be an embarrassment of riches. The only problem about Britten hitting the heights, above all in setting toweringly great poetry by Auden, Blake, Donne and Hölderlin, at the top of a long list, meant one sitting and squirming at most of Ronald Duncan’s wretched lines for an opera which even in its very subject is problematic, The Rape of Lucretia.

No gods, ancient Egyptian or otherwise; no sinister priest along the lines of Russia’s antichrist Patriarch Kiriil, sending soldiers to their deaths with the promise of heaven. Military ritual under what looks like a Russian/Chinese flag prevails in Robert Carsen’s severe take on Aida, more rigid than Verdi’s surprisingly unified late score - a musical masterpiece if not a dramatic one.

Irish soprano Jennifer Davis, a stunning Elsa in this Royal Opera season's revival of Wagner’s Lohengrin, was the lure to sit through Jan Philipp Gloger's Mozart Così again (the title, by the way – "All Women Do It" – belies the complexity applied to a schematic plot). As it turned out, the mixed-up couples were all love’s young dream, which made it all the more of a shame that this production remains determined to squash their hopes and even their new matches.

Words and situations are one-dimensional, but the music is chameleonic, if not profound, and crafted with a master’s hand. What to do about Saint-Saëns’s Biblical hokum? In Richard Jones’s new production, the end justifies the means, with persecuted Hebrews and mocking Philistines circling two essential star turns, and Antonio Pappano’s handling of a hard-to-pace score is vivid from opening keenings to final cataclysm.

It has been a difficult couple of years for us in the world of opera, losing several of our most respected and admired colleagues who have inspired us over several decades.

David Alden’s Lohengrin is back at Covent Garden for a first revival. The defining image the first time round, in 2018, was of the ending, a political rally for King Henry’s regime, with Lohengrin and the swan as its icons. That felt crude – a two-dimensional morality, and tangential to the story.

"Why does he have to sentimentalise this piece?", Britten is reported by former Royal Opera director John Tooley to have said of Jon Vickers as Peter Grimes the tormented fisherman, so very different from the composer's life partner and creator of the role Peter Pears. Britten didn't qualify his disappointment by stating what for most of us is obvious: Vickers was one of the great tenor voices, and his latest successor in the role, Allan Clayton, is heading for that kind of status too.

Two Royal Opera staples, Verdi's La traviata and Puccini’s Tosca, now come round with too much frequency for critical coverage. It looks like Director of Opera Oliver Mears’ Rigoletto will do the same. Yet the production’s September 2021 debut was clouded by routine performances from its protagonist baritone and tenor Duke of Mantua, so a second visit was due to see if fresh casting might make a difference.

Some of Handel's late London oratorios, like the indestructible Semele, work well as fully staged operas. Others, usually the ones which swap mythology for the sacred, need dramatic help. Theodora is one of them, though Peter Sellars' now-legendary Glyndebourne production had a once-in-a-lifetime intensity. The singing if not the acting is more fitfully stunning here, but Katie Mitchell just about pulls off one of her most vivid and focused reimaginings.