John Healey is not a rash man. Slow to anger, calm in a crisis, loyal and yet beneath it all, formidably determined. He stuck at it through the Jeremy Corbyn years, much as he privately despaired of where the party was heading, keeping his thoughts to himself because all he wanted was for Labour to win again. When it did, under Keir Starmer, he became the understated anchor to a frequently gale-tossed ship of government; the solid citizen everybody liked and nobody distrusted, a natural choice for caretaker leader had Starmer ever fallen under a bus.

Or, perhaps, been pushed under a tank.

For a defence secretary to resign weeks before a critical Nato summit, in the middle of conflict in the Gulf and on the eve of a domestic byelection which will determine his party’s future, is extraordinary in itself. But it’s that bayonet of a resignation letter – painting the prime minister as weak and impotent, incapable even of finding the money to keep the nation safe – that now threatens to finish off an already badly wounded premiership.

Despite accepting the case for more defence spending, Healey wrote to Starmer, “you have been unable, and the Treasury has been unwilling” to find the money to keep the nation safe. That “unable” is the key, reflecting what is said freely behind closed doors: that a prime minister who always hated settling........

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