The UK's military chief has written to the prime minister amid concerns that an offer of around an extra £13bn to fund a major investment plan for defence is not enough, Sky News understands. The content of the letter from Air Chief Marshal Sir Richard Knighton is not known, but the fact he felt the need to put his thoughts in writing signals the seriousness of the challenge faced by Sir Keir Starmer as he attempts to finalise the long-delayed defence investment plan. The highly unusual move came after the Treasury is understood to have offered the Ministry of Defence (MoD) around an additional £13bn over four years to help fund the purchase of new jets, submarines, ships, drones and missiles. This is at the lower end of a range of between £12bn and £18bn that had been under consideration – and far short of the actual sum of extra money that the military believes it needs to rebuild its hollowed-out ranks at a time of escalating threats. One source said Air Chief Marshal Knighton met with fellow military chiefs to discuss the proposed settlement on Monday. The source said there is thought to have been dissatisfaction expressed by at least one of the service chiefs who were present about the inadequacy of the amount. That has not been confirmed, however. Full story ⬇️ news.sky.com/story/military-…

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