To go boldly: UK Strategic Defence Review 2025

The UK Government has now published its long-awaited Strategic Defence Review (SDR). Speaking at a BAE Systems shipyard on the Clyde, the Prime Minister said the UK military is moving to ‘war-fighting readiness’ and, in step with the wider growth agenda, Sir Keir emphasised a role for the whole country in this new defence enterprise.

This review differs significantly from previous strategic defence (and security) reviews, and its output will be followed closely by allied capitals. It has the potential to be a transformational blueprint, with offensive cyber, technology and autonomy at its centre, to face the ‘new era of threat’.

The SDR was led by the respected former Labour Secretary of State for Defence and past NATO chief Lord Robertson, with an extended external team including Dr Fiona Hill and General Sir Richard Barrons. Commissioned soon after Labour returned to government in July last year, it is the UK’s first externally led defence review. Its aim is to make a forward-looking assessment of the UK’s strategic defence interests and outline the corresponding military requirements. This is no easy ask in such a fast-changing world, which is in part why we also see the early confirmation of big-ticket commitments, including new hunter-killer submarines, a £15 billion nuclear warhead programme to equip the bomber boats, and new long-range weapons.

In the strategic context, the review is clear that both Russia and China are big state threats. It also highlights the growing role the digital world will play in the global defence and security landscape, and the review is the first of its type to put a significant focus on cyber capabilities.

The balance here is between resource and the review’s four lenses: NATO-first; global responsibilities; homeland defence; and hybrid grey-zone activity such as cyber-attacks. Artificial intelligence and drones are transforming modern warfare, so the government has committed to set up a new cyber command with a £1 billion package of investment. There is also good news for MBDA and BAE who will be in line for the new ‘defence factories’ as the UK gets serious about munition supplies, with a £1.5 billion commitment to establish at least six munitions’ facilities.

The Ministry of Defence is still experiencing challenges to frontline budgets and decisions in the government’s upcoming spending review, due to be announced on Wednesday 11 June, will demonstrate No.10 and No.11’s seriousness about putting the SDR’s findings into action.

Friends and adversaries alike will keep a close eye on whether this latest SDR will deliver for UK defence. In the near term, all of us involved in defence and security await the publication of the government’s industrial strategy, expected alongside next week’s spending review, and the many opportunities it will bring to engage with government in the weeks and months ahead.