True Brit, I take it that "Katherine Paa" was just a typo, for "Paar."

it's funny how many mondegreens of "sweet san fairy ann" there are here. LOL

I've always thought it was,

"Oh, how the sweet Sam Perry, Anne, do I know who you are ... ?"

And since I had no idea who Sam Perry was or what the expression was about, I usually changed it to "... how the bloody devil, Anne, do I know who you are ... ?"   (Being a Yank, my audiences wouldn't get the "sweet san fairy ann" reference any more than they would " ... sweet Sam Perry ... ."

Genie