The Labour party spent 14 years in the wilderness, following the general election of 2010. It has taken only 18 months for the political project with which it returned to power to implode. The resignation of Morgan McSweeney, Sir Keir Starmer’s chief of staff and the man credited with orchestrating his path to Downing Street, has left the prime minister isolated, rudderless and at the mercy of events he is in no position to control.

Mr McSweeney fell on his sword after taking responsibility for backing the appointment of Lord Mandelson as US ambassador, despite what was known about the peer’s friendship with Jeffrey Epstein. The hope, clearly, was that his departure will give the prime minister the breathing space to reset yet again. Monday’s call for Sir Keir’s own resignation by Anas Sarwar, Labour’s leader in Scotland, soon dispelled that illusion, although it also provoked a show of loyalty from cabinet colleagues.

What now? The prime minister has indicated that he........

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