Peter Trudgill estimated in 1974 that 3 per cent of people in Britain were RP speakers, but this rough estimate has been questioned by the phonetician J. Windsor Lewis.
Peter Trudgill在1974年的研究顯示，在全英國，約有3%的人使用公認發音，但這一粗略的計算被語音學家J. Windsor Lewis質疑。