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I think the words aren't contracted because most people (at least, I assume in the U.S.) have two ideas when it comes to the British accent. Cockney (what we think of as the hillbilly not sophisticated accent) and the posh accent (i.e. the British butler, which oftentimes are made to sound as though they don't use contractions). I believe that most try and emulate this "butler speak" so that their British characters sound smart and appeal more.