UK prepares for war: How much will it cost?

The UK's Strategic Defence Review (SDR) outlines a major military investment in response to growing threats, particularly from Russia, with plans to boost weapons production, build new submarines, and invest in nuclear warheads, costing an estimated £67.6 billion through the late 2030s. While the government has pledged to increase defense spending to 2.5% of GDP by 2027, critics argue that 3% is needed to fully fund the SDR, potentially requiring tax increases or cuts to other budget areas, with NATO pushing for even higher defense spending targets among its members.

Analysis

The United Kingdom's Strategic Defence Review (SDR) outlines a significant reorientation towards 'war-fighting readiness' and a 'NATO first' defence posture, driven by perceived immediate threats from Russia and persistent challenges from China. This strategy entails a projected expenditure of at least £67.6 billion ($91.4bn) through the late 2030s, with key investments including £1.5 billion ($2bn) for at least six new munitions factories aiming to produce 7,000 long-range weapons, an increase in UK ammunitions spending to £6 billion ($8.1bn) by 2029, the construction of up to 12 new attack submarines by the late 2030s (accounting for nearly half the SDR's projected spending), and a £15 billion ($20.3bn) investment in the UK's nuclear warhead programme. Additionally, the SDR recommends procurement of new F-35 fighter jets and a £1 billion ($1.35bn) 'digital targeting web' leveraging AI to enhance military effectiveness, aiming to 'increase lethality tenfold' without a dramatic increase in troop numbers. Funding this expansion presents a considerable challenge; while the government plans to raise defence spending from 2.3% to 2.5% of GDP by 2027 (generating an estimated £60 billion over 10 years, partly by cutting overseas aid), this falls short of the SDR's costings and the 3% of GDP deemed necessary by the review's authors and critics, which would require an additional £17 billion by 2030. Further pressure comes from NATO, with proposals for member nations to commit up to 5% of GDP to defence-related spending by 2032. Consequently, the UK faces difficult fiscal decisions, with potential for 'chunky tax increases' or significant reallocations from other public spending sectors, as highlighted by the Institute for Fiscal Studies. UK defence companies are positioned as primary beneficiaries, with further details anticipated in the upcoming Defence Industrial Strategy, though the long-term nature and potential for strategic re-prioritization, as seen with the 2021 SDR, introduce an element of uncertainty.

Key Decisions for Investors

• Investors should assess opportunities within the UK defence sector, particularly companies involved in munitions, submarine construction, aerospace, and defence technology, given the outlined multi-billion pound investment plans and explicit mention of defence companies as 'big winners'.
• Closely monitor UK fiscal policy developments, including potential tax increases, further spending cuts, or increased government borrowing, as the c.£67.6 billion SDR funding gap and NATO pressures for higher spending could significantly impact the UK's economic outlook, gilt yields, and sterling.
• Anticipate the release of the UK's Defence Industrial Strategy for specific contract awards and a clearer view of corporate beneficiaries, which will be crucial for targeted investment decisions within the defence supply chain.
• Consider the heightened geopolitical risk environment as a driver for sustained defence spending, but also acknowledge the inherent uncertainty in long-term government commitments and the potential for strategic priorities to shift, impacting the longevity and focus of these investments.