Katie Mitchell’s production of Lucia di Lammermoor opened at Covent Garden in 2016 and now returns for a first revival. Royal Opera were clearly expecting great things, even from the start, and this is the third cast to have presented the show, after two separately cast runs last year, and a commercial DVD is also available. Mitchell has repaid their confidence with an impressively conceived production: visually arresting, suitably dramatic and with many subtle narrative additions.

Now we know who sent Jonas Kaufmann the Union Jack boxer shorts for the Last Night of the Proms. Whether the sender’s identity is the bigger surprise, or the hint of ambiguity over whether the "Greatest Tenor in the World" had previously heard of one of Britain’s favourite baritones – well, you decide. And no, we don’t learn who threw the knickers at him from the arena.

“I’m not in the mood” – “non sono in vena” – sings aspiring poet Rodolfo as he settles down to write a lead article. Was it me, or had the mood not settled by the premiere of the Royal Opera’s first new production of Puccini's structurally perfect favourite for 43 years? The singing was good to occasionally glorious, Antonio Pappano’s conducting predictably idiomatic and supportive.

They get to work with the best music and language coaches in the business. They make their mark in small parts throughout the Royal Opera season and showcase their art more prominently at the end of it, proving to the world that there are major talents among them (four outstanding ones, I reckon, on this showing).

Why stage a stiff opera about half-frozen royals by a not-yet-divine Mozartino? The best Mitridate really deserves is one of those intimate concert performances with brilliant young singers at which Ian Page's Classical Opera excels.

Recorded on disc, this cast would be extraordinary for much of the time — to look at, not so much.

"È un'immensa pietà" - "it's heartbreaking," rather than "it's a huge pity" - sings consul Sharpless of "Butterfly" Cio-Cio San's fatal belief that her American husband will return to her.

Recent British-based productions have taken Wagner's paean to creativity, the reconciliation of tradition and the individual talent, at face value.

Adriana Lecouvreur deserves to be better known. The opera has a toe-hold in the repertoire, with occasional appearances, usually as a showcase for the soprano in the title role. Its composer, Francesco Cilea, is known for little else, but the opera demonstrates an impressive melodic gift, an ear for orchestral colour, and a rare ability to pace music in step with a complex and extended narrative.

It takes some pretty special casting to spice up Richard Eyre’s Royal Opera regular, currently returning for its 14th revival (with a 15th on the cards later this year). And that’s exactly what was on the bill here, with house debuts from both Joyce El-Khoury’s Violetta and Sergey Romanovsky’s Alfredo. If the result was at times uneven, it also had an energy, an uncertainty, that gave it a freshness lacking in more polished revivals.