In 2017 there was a miracle. The Momentum version was that, lo, when JC walked among the people and they saw him and heard no longer just the words of the Pharisees, then the scales fell from their eyes and they did love him.

The scripture of the European Research Group, however, has it that it was the fault of the benighted Theresa who connected not with the faithful and enthused them not.

Either way the Earth moved. In June 2016, just after the referendum, the polling organisation ICM had the Tories at 36 per cent and Labour at 32 per cent. In the weeks before the 2017 general election, an ICM poll suggested a Tory lead in the double digits and a majority of…