Estuary is an accent derived from London English which has achieved a status slightly similar to "General American" in the us.

河口英语口音来源于伦敦英语，现在它在英国的地位有点类似于“通用美国英语”在美国的地位。

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In general, American spelling is more simple than the British. These easier spelling words in American English are all from British originally, but the Americans made it easier to use.

一般来说，美式拼法要比英式拼法简单，这些词其实都是从英式英语来的，只不过美国人把它变得更简洁实用了。

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On March 5, after they had spent the day in the talks known as the General Congregation, a group of them from around the English-speaking world gathered inside North American College, a school nestled on a hill above the Vatican, where U.S. bishops send seminarians to train for the priesthood.

WSJ: With Speech, Cardinal Set Path to Papacy