What a Lovely Tune

I say, what a lovely tune!

Ah, here she comes
Hello, darling
Shall we sit here? It's nice and quiet
Would you like a cup of tea?
Milk?
Sugar?
Oh, you don't, do you?
Still, never mind

I say, what an enchanting melody
Shall we dance?
Oh, I'm sorry about that!
I say, shall we go out onto the balcony for a bit of fresh air?
Ah, that's better
May I?
Oh, this is madness!
Oh, I'm sorry about that
Oh well, we may as well go and dance again, what?

I say, what a lovely tune!
I wonder who wrote it