G7 live: Brexit deal with EU now 'touch and go', says Johnson

Of the foreign policy issues confronting Brussels, none is more pressing - or carries the same explosive threat - as that of Iran and the Joint Comprehensive Plan of Action (JCPOA) signed in July 2015.

The new PM shows no sign of seeking a broad consensus on great national issues, no indication that he will make good on his promises during the leadership election and try to bring the country together.

Humanitarian work when endorsed by a celebrity has to walk a tightrope - if it is too policy-oriented, it becomes an unelected individual trying to usurp power from elected leaders. If it is too general or purely values-based, one can fall into the trap of retweeting slogans that mean little.

A wave of populist electoral triumphs has been presented by those who have surfed it into power as reflecting a turn in history’s tide. They should know their history better, argues Robin Wilson.