I enjoyed the programme too.
It was nice to hear snippets from the Britten recording, as I had never heard the original version before. The singing sounded softer, more simple and more free than what one is used to nowadays. I am especially determined now to get myself the original recording and give the opera another try. 'The Turn of the Screw' is one of the few Britten operas that has always failed to interest me, which I find extremely odd, given my love for 'Grimes', 'Billy Budd' and 'Death in Venice', and the wide popular and critical acclaim the opera has. I'm guessing the fault is in me. It's not that I didn't try: I listened to the Colin Davis recording with Helen Donath as The Governess, I saw the film dvd with Lisa Milne, I even saw it live once, with the gorgeous Mireille Delunsch as a Governess with a slight French accent...

But it never riveted me the way the others did. I'm thinking maybe the original recording will open my eyes/ears to some as yet undiscovered beauty in the score

Or else not, can't like everything... (Then again, with all Britten operas I started out hating them, kept on listening, and ended up loving them. Very strange...)
The Pears recording of Pélotin reminded me of the fact that Pears' voice is often so strange-sounding that it suggests something totally mysterious, out of this world (sound-wise that is)... It reminded me too how Britten often uses this quality of utter strangeness in his voice to make up his own, very special sound-world... It was this special and very individual sound-world that attracted me to Britten's music first, I think... I'm thinking of the long melismatic phrases he often wrote for Pears, i.e. that last long utterance of 'Peter Grimes' in the Peter Grimes Mad Scene, or the War Requiem's 'Dona nobis pacem', 'Promène toi la nuit' from the Antique in 'Les Illuminations', the word 'lulling' from the Sonnet in the Serenade... And more in general I keep finding this sound-world in several beautiful and long, chromatic (I think) phrases that I think are typical for Britten: the litanies of the Madwoman in Curlew River, 'What harbour shelters peace', 'Turn the skies back and begin again', 'My only hope is held by you', 'It seemed that out of battle I escaped', 'Strange friend, here is no cause to mourn', 'The shades keep down which well might roam her hall', 'Low lying clouds, unending grey', 'How I love the sound of the long low waves...', 'So the moments pass, and as they dwindle...', and so on...
Does this make any sense?
Back to the programme: I thought Basil Coleman was a very charming man. I liked the way he so sincerely agreed with Mr Evans: 'Quite so. Fascinating. How interesting.'

Looking forward to 'A Midsummer's Night Dream', the only Britten opera I have NEVER heard before. Hoping for a pleasant surprise...
It's strange, because Britten was/is seen by many as very buttoned up himself, and his music likewise, but I feel that much of his music is deeply erotic - somewhat submerged, maybe, as was necessary for his time, but all the more profound for that.
I think you have captured the essence of a lot Britten's music here, in my opinion. This is the reason, I think, why Britten's music is often disliked, because the erotic, passionate quality is, as you say, submerged beneath a surface of stiff and spare sounding music.
Greetings