I think a lot of people at the time *did* use slang words while otherwise speaking in very RP accents (far more traditionally RP than today) - that's one of the most interesting things about seeing archive footage of middle-class young people in the 1960s/70s, the almost shapeshifting nature of their speech and mannerisms.
The headmaster of Marlborough College (one of the main fee-paying schools in the UK) commented about the changing accents and speech patterns of his pupils, and the drift towards a "classless" accent, as early as November 1965 (the same year as 'The Thuggery Affair'), and he significantly went on to comment that when they spoke to their elders they still used the traditional public school accent - they had effectively developed two languages, whereas only four years earlier, at the time of 'Peter's Room', they would probably still have used the older public school accent *all the time*, including amongst themselves.
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timeasmymeasure
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Date: 2008-06-28 12:31 am (UTC)The headmaster of Marlborough College (one of the main fee-paying schools in the UK) commented about the changing accents and speech patterns of his pupils, and the drift towards a "classless" accent, as early as November 1965 (the same year as 'The Thuggery Affair'), and he significantly went on to comment that when they spoke to their elders they still used the traditional public school accent - they had effectively developed two languages, whereas only four years earlier, at the time of 'Peter's Room', they would probably still have used the older public school accent *all the time*, including amongst themselves.