Former Shadow Chancellor John McDonnell’s quick public support for Long-Bailey is one barometer of that strength of feeling, along with a parallel show of support from Momentum founder Jon Lansman, in spite of Lansman’s recent enthusiasm for an accommodation with the ‘soft left’.

But the action goes beyond expressions of support for Long-Bailey – and the drivers for action go beyond her sacking.

Left MPs are now generating a list of supporters for a leadership challenge to take place next year, after the 2021 local elections, in the event that Starmer fails to shape up.