Rimsky-Korsakov’s bizarre final fantasy, puffing up Pushkin's short verse-tale to unorthodox proportions, has done better in Britain than any of his other operatic fairy-tales. That probably has something to do with its appearance in Paris, six years after the composer’s death in 1908, courtesy of a brave new experiment marshalled by that chameleonic impresario Sergei Diaghilev.

The latest in a series of "Pinnock’s Passions" concerts at the Sam Wanamaker Playhouse saw the doyen of period instrument performance lead a delightful exploration of Handel the musical borrower, entitled "Handel’s Garden". As Trevor Pinnock writes in the programme notes, "throughout his life as a composer he had the habit of taking cuttings, transplanting and grafting from works old and new".

The Royal Opera House’s Maria Stuarda is the third major production of Donizetti’s historical opera in less than two years. First there was David McVicar’s kitschy-traditional production for the Met, then there was Rudolf Frey’s baffling concept-drama at Welsh National Opera, and now directors Moshe Leiser and Patrice Caurier add their voices to a conversation still trying to make sense of these passionate warring queens with their determinedly dispassionate music.

Speaking from the stage before curtain-up on The Barber, Longborough’s founder and chairman, Martin Graham, stressed the hard work put in by director Richard Studer and conductor Jonathan Lyness on their two 2014 productions, this one and Tosca. He wasn’t kidding. Read the programme and you find (for both operas): director, Richard Studer; designer, Richard Studer; costume, Richard Studer. Lyness conducting both works.

“Is this sheltered place the wicked world where things unspoken of have been?” The Governess’s question echoes through the careful suggestions and delicate temporal interweavings of Annilese Miskimmon’s The Turn of the Screw, twisting smiles into sordid suggestions, schoolrooms into places not of care but corruption.

There are two avenues down which to approach the well-kept flower beds of Mozart’s early operas. One is to be surprised how rarely the muse of fire which rages through Idomeneo, his first undisputed masterpiece, descends on a work composed just a few years earlier like La finta giardiniera (The Counterfeit Garden Girl), and that’s how I felt sitting through a performance of it for only the second time in my life.

Can it really be 12 years since Antonio Pappano inaugurated his transformative era as the Royal Opera’s Music Director conducting Strauss’s Ariadne auf Naxos? Christof Loy’s production seemed so radical at the time.

For Longborough to open their new season with Tosca after last summer’s triumphant Wagner is to invoke Joseph Kerman’s famous diatribe against Puccini’s “shabby little shocker” in his fifties book Opera as Drama. Kerman used Wagner’s theories to pick holes in Puccini’s at times flagrant theatricality: which only goes to show what an untheoretical thing opera can be.

Grange Park Opera has a strong penchant for French repertoire, and has been valiant, consistent and highly imaginative in presenting it ever since 1998, when Wasfi Kani and Michael Moody first started inviting opera-goers to the unique setting of a Greek revival house in the Hampshire countryside. This year's production  of Massenet's 1909 Don Quichotte is the eighth French work which the company has produced. Samson et Dalila next year will be the ninth.

Rolling hills with beech-rich woods sloping upwards from a wide valley: the Wormsley Estate has more than a little in common with glorious Hukvaldy in Moravia, where Janáček was born and ended his life, and where in old age he once again saw "his" vixen. With an admirable independence of mind that seriously underrated director Daniel Slater has gone against the grain inside the fabulous pavilion where Garsington’s operas now resound.