It is a year since Jeremy Corbyn denied Theresa May a Commons majority. Many Labour members believe that had the campaign been longer Mr Corbyn would now be prime minister: they think he can still enter No 10.

Mr Corbyn’s performance struck dumb those MPs unconvinced by Labour’s new management. But recently some have expressed concern over their leader’s response to Salisbury, antisemitism and Brexit. Such random acts of criticism have not, however, diminished Mr Corbyn’s support.

If they are to win back the party, Mr Corbyn’s critics need him to fail to win power and the evidence is mounting that fail he will. But that is only a precondition for their return.

Critics need to build bridges to members who believe they have more