ɪn nˈaɪntiːnhˈʌndɹɪd twˈɛnti sˈɛvən, hˈɑːlbɔːɹn, ðə fˈɜːst dᵻɹˈɛktɚɹ ˌɔːɾəmˈæɾɪk ɛkstʃˈeɪndʒ ɪn lˈʌndən, wʌz kˈʌt ˌoʊvɚ tə ðə nˈuː sˈɪstəm æt mˈɪdnaɪt ˌɔn sˈæɾɚdˌeɪ twˈɛlv noʊvˈɛmbɚ.
In 1927, Holborn, the first Director automatic exchange in London, was cut over to the new system at midnight on Saturday 12 November.