Nuclear spending becomes unusually large when successive governments postpone infrastructure and programme costs. An additional £20 billion over four years is intended to fund deterrent submarines, warheads, a nuclear-fuels programme, successor studies, and estate upgrades. Compressing decades of work into four years makes the enterprise look like a sudden expansion even where it is clearing a backlog. France provides the comparison for paying these costs steadily over the preceding twenty years. The F-35A's nuclear role may also explain its purchase being assigned to the ring-fenced nuclear budget, although that accounting motive is a suspicion.
Chapter · 40:44-42:37
Deferred nuclear infrastructure compresses decades of cost
The nuclear-enterprise allocation is presented as a backlog bill for submarines, warheads, fuel, docks, and facilities rather than a sudden optional expansion.