A run of volatility in domestic British politics in recent years has tracked a period of global turbulence, and yet foreign policy over the same period has been an area of relative stability. What little is known about Andy Burnham’s approach to international relations expresses more continuity with Sir Keir Starmer’s administration than deviation. In negotiations with the EU, the red lines that prohibit membership of the single market or customs union still stand. Where Washington is concerned, Mr Burnham shows no interest in performances of bonhomie with Donald Trump, but his predecessor had already swapped that approach for a cooler pragmatic tone by the end of his tenure.

The new foreign secretary, Ed Miliband, has opened a good dialogue with Marco Rubio, his US counterpart. Such is the density of integration in defence and security matters that incoming........

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