Should the Defence Investment Plan prioritise turning spending into measurable military capacity over setting higher GDP percentage targets?

There's a technocratic mood behind this result — a preference for outcomes over optics that saw the Defence Investment Plan's capability test beat the GDP-percentage framing comfortably, on a two-to-one verdict. It reads less like a verdict on how much Britain should spend on defence than on how it should be judged for spending it.

The generational pattern is the more telling clue. The 45-64s, old enough to remember Cold War budgets and NATO burden-sharing rows, backed the capability framing almost unanimously, while the youngest and oldest cohorts were far more evenly torn — suggesting the middle-aged are most persuaded that a target hit on paper means little if kit isn't ready, while pensioners, perhaps more instinctively attached to the reassurance value of a headline GDP figure, hung back. Gender split just as sharply: women here backed the capability test heavily, men were split almost exactly down the middle, hinting at a divide between those who trust process metrics and those still minded to judge defence policy by the size of the number attached to it.

That fault line — inputs versus outputs — has dogged the 2.5-3.5% GDP debate since it began, echoing wider arguments about NATO commitments, procurement waste and whether percentage targets are reassurance theatre for allies rather than a real measure of readiness.

If Reeves and Jarvis wanted permission to talk capability over cash, this chamber gave it to them, though not without men still wanting to see the number too.