In England it is another class thing. I was taught that it is terribly "naff" to cut one's roll; it should always be broken by hand. And both toast and rolls should be buttered (or spread with marmalade) a bit at a time.
What/pardon is by way of being largely class-determined. "What" is acceptable except in lower middle-class circles. "Pardon" is naff, and "I beg your pardon" is OK, but a little OTT.
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