Hennessy, Peter (2001). “Beyond any Mortal? The Stretching of the Premiership Since 1945”. The Prime Minister: The Office and Its Holders Since 1945. New York: Palgrave. p. 90. ISBN0-312-29313-5. "[T]he failure to pick up the BBC Today programme for a few days is regarded as the ultimate test.(BBCの番組『トゥデイ(英語版)』を数日間に渡り受信できないことが、究極の確認とみなされている。)"