Ooh, I hadn't thought of it being a country difference, I just sort of assumed it was a different theatre/television company thing, but you might be right yes.
Oh, and following indefatigable42's advice to put "Walla, walla" in the search term string worked, and I learned that Father was telling me the truth, in part -- "peas and carrots" is one thing (of several options) that background actors can say for word noise.
I think it only became a catchphrase for mindless talk just for the two of us, though -- a private joke...
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Oh, and following
I think it only became a catchphrase for mindless talk just for the two of us, though -- a private joke...