David Crystal claims that the sound can be heard in Received Pronunciation (RP) speakers from the early 20th century such as Daniel Jones, Bertrand Russell and Ellen Terry. The Cambridge English Pronouncing Dictionary claims that t-glottalization is now most common in London, Leeds, Edinburgh, and Glasgow.
David Crystal asserts that the sound can be heard in Received Pronunciation (RP) speakers from the early 20th century, such as Daniel Jones, Bertrand Russell, and Ellen Terry. The Cambridge English Pronouncing Dictionary states that t-glottalization is now most prevalent in London, Leeds, Edinburgh, and Glasgow.