In this week's episode I explore the Prime Ministers we never had. All the factors that blocked them apply to Boris Johnson making it much less likely that he will be the next PM. In connection with Boris' fate I also reflect on my next BBC series of unscripted TV talks on the theme of 'PMs We Never Had' and why ad libbing to camera in a single take is a good way-in my view- of conveying the drama and epic significance of politics.

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