UK Defence Committee warns of capability gaps as NATO obligations questioned; government pledges to avoid “hollowed out” forces

LONDON, November 19, 2025 – A UK parliamentary Defence Committee report published on Wednesday warns that the United Kingdom is failing to deliver on aspects of its NATO obligations, spotlighting shortfalls in mass, land warfare readiness, and integrated air and missile defence. The findings landed the same day UK Defence Secretary John Healey said the winter budget would “ensure no return to the hollowed out and underfunded” military of the past.

Key points at a glance

• Perception shift: Allies increasingly view the UK as a non-peer partner, the committee heard.
• NATO obligations: The report cites failures against Article 3 commitments and the absence of a Defence Investment Plan.
• Capability gaps: Weaknesses highlighted in land domain mass and integrated air and missile defence.
• Artillery shortfall: The British Army currently fields 14 Archer 155mm systems pending the planned RCH 155 around 2030, following the retirement of its previous 155mm artillery fleet.

Committee findings raise concerns over UK readiness and leadership in NATO

The Defence Committee’s report, released on 19 November 2025, cautions that the UK would struggle to deploy and sustain forces at scale in a high-intensity conflict, raising questions about the country’s ability to meet alliance expectations.

The report states: “We were concerned to hear that the UK’s lack of mass is denuding its leadership in NATO”, and adds that the “lack of resourcing dedicated to the UK meeting its Article 3 commitments is a further failure of leadership.”

Testimony cited by the committee indicated that one US official in NATO circles no longer considers the UK a Tier 1 military force. The committee also warned that the delay to the Defence Investment Plan is obscuring priorities and complicating procurement planning across the armed forces.

Air and missile defence flagged as urgent priority

The report underscores the absence of a layered, integrated air and missile defence (IAMD) for the UK homeland and critical national infrastructure. The committee concluded: “The lack of clarity about the Government’s approach to integrated air and missile defence, given the absence of European IAMD capability, is an area of critical importance that requires urgent action,” the committee warned.

Concerns about the protection of defence sites have also grown following a recent activist incursion at a key RAF base, which drew attention to gaps in physical security and resilience.

Land warfare mass and artillery availability under pressure

The UK’s land domain readiness-particularly in heavy armour, ammunition depth, and modern battlefield capabilities such as FPV drones-was highlighted as a vulnerability. According to prior reporting, the government divested the British Army’s legacy 155mm artillery fleet. In the interim, the Army has 14 Archer systems available at 155mm or greater until the planned RCH 155 enters service, likely around 2030.

Maritime sustainment strains persist

Separate assessments underline persistent challenges across the maritime domain, with the Royal Navy and Royal Fleet Auxiliary managing a smaller escort fleet and ongoing sustainment pressures amid long-running recapitalization programs.

Government response: spending pledge and winter budget commitment

Speaking on the day of the report’s publication, Defence Secretary John Healey said the forthcoming winter budget-expected to tighten public spending-would “ensure no return to the hollowed out and underfunded” military of the past. The government has recommitted to increasing defence spending, though meeting targets will require careful fiscal planning, according to previous analysis.

NATO obligations and next steps

The committee’s findings focus attention on the UK’s NATO Article 3 commitments, which require allies to build and maintain the resilience and capabilities necessary to resist armed attack. The report urges clearer direction on integrated air and missile defence and a prioritized investment roadmap to restore mass and readiness across the services.

Conclusion: scrutiny intensifies as budget nears

The Defence Committee’s report places UK military readiness under renewed scrutiny ahead of the winter budget. With allies questioning the UK’s mass and sustainment and the committee calling for urgent clarity on IAMD and a delayed Defence Investment Plan, upcoming fiscal decisions will be pivotal to addressing capability gaps and reaffirming the UK’s role within NATO.