John Milton, the one who wrote "Paradise Lost" had a cottage in Chalfont St Giles and he regularly used "gotten" in the mid seventeenth century. Can't get more Home Counties than that.
This talk of accents and dialects makes a valid point. Widespread printing and literacy meant that certain writers of English could be read widely outside their local area, cue the beginning of the end for local dialects.
In the same way, the sheer volume of American literature, films and television mean that American expressions will continue to have an increasing influence on a language which is in a permanent state of flux.
Shakespeare's language was heavily influenced by Latinised words which were entering English at the time or the renaissance so he was not, in any sense writing in any "pure" dialect, he was writing in English which had been recently changed by the influence of other countries and the mass media of the time, printing.
Language changes.