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I can't tell you much about received pronunciation. It's generally considered here to be a relic of the days when Britain was Home, and the BBC was the fount of all wisdom. We listened to its news bulletins through a background of static picked up as the radio waves bounced halfway around the world, so if we'd placed much reliance on what we heard as a basis for our accent it would have come out quite oddly.
Some would say it has anyway. Apparently the U.S. judges of your spelling bee contest had great trouble with the accent of the sole competitor from NZ, and Aussies have been rubbishing us for years. They say "feesh & cheeps" according to us, and according to them we say "fush & chups". Or, to quote a piece of graffiti in Sydney: "Australia sux", to which someone replied :"NZ nil".
We have no money; we must use our brains. -Ernest Rutherford.