The much-anticipated Defence Investment Plan (DIP), unveiled by Prime Minister Sir Keir Starmer, carries a significant £4.7 billion price tag, presenting a substantial financial hurdle for his potential successor, Andy Burnham. The plan, released just before Starmer's final major foreign event as premier, aims to address pressing defence needs but leaves considerable trade-offs for the next government to manage.

The DIP's delayed publication and the substantial figures involved highlight the difficult choices facing the UK's national security and public finances. The plan's release now means the incoming administration, expected to be led by Burnham, will have to confront the funding gap and potential further increases in defence spending as a general election approaches.

Sharp disagreements over the plan's implications have already surfaced. Serving minister Hamish Falconer publicly voiced frustration regarding the uncertainty surrounding the A46 Newark bypass road widening project, a local concern in his constituency. The need to find an additional £5 billion from existing budgets to meet the DIP's requirements is likely to cause further dissent among government backbenchers.

Sir Keir Starmer, in his final months as prime minister, acknowledged the difficult decisions involved in the DIP. He framed its publication as fulfilling a promise before the upcoming Nato summit in Ankara, Turkey, thereby avoiding further embarrassment. By securing a deal that his Defence Secretary, Dan Jarvis, could endorse, Starmer has also preempted the need for Burnham to present the plan himself in the near future.

While Burnham has not yet commented on the DIP, Defence Minister Luke Pollard indicated that discussions between Downing Street and Burnham's team regarding the plan have been ongoing. Pollard noted that Starmer, throughout his premiership, has consistently highlighted the difficult trade-offs inherent in governance, particularly in the current economic climate characterized by an anaemic economy, high taxation, and national debt.

Former Defence Secretary Sir Ben Wallace described the DIP as an attempt to provide Sir Keir with a 'leaving present.' However, he suggested that upon closer examination of the figures, fundamental changes to defence spending or strategy remain limited. Sir Keir, in his remarks, adopted a tone of a leader who had thoroughly examined the numbers and their consequences, emphasizing that the job of a prime minister involves confronting such trade-offs.

Sir Keir stated that while some will always argue the allocated sum is insufficient, he believes he is leaving the country in a better state. He acknowledged the inevitable departmental and Treasury wrangling over budgets, stressing that the prime minister and chancellor must make overarching judgments on affordability and prioritization.

The subtext of Sir Keir's announcement seemed to be a tacit acknowledgement of the challenges ahead for the next leader, implying that the task is more complex than it appears, particularly given the economic pressures and the recent rejection of his welfare reform proposals by his own MPs, which further complicated his agenda.