On a table in Robert Jenrick’s parliamentary office lies the first part of Ronald Hutton’s biography of Oliver Cromwell, a conventional MP who became radicalised by events and usurped a monarch. The shadow justice secretary is very on message when it comes to the prospect of regicide in the Conservative party (‘I’m just doing my job. Kemi is the leader’). But as one who recently travelled to Calais to berate the French authorities for facilitating Channel small boat crossings, Jenrick has found unlikely inspiration in another bloody-minded leader. ‘I’ve been reading biographies of de Gaulle over the summer and he had a line that “Treaties are like roses, they last as long as they last”. I think that’s where we are.’

In his sights are Britain’s membership of the European Convention on Huma

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