Conservatives Unveil £10bn 'Britannia Shield' Plan to Overhaul UK Air Defences

The Conservative Party has committed to building a new missile and drone defence network should it return to power at the next general election, promising to spend as much as £10bn over ten years on the project it has named "Britannia Shield."

The proposal, announced ahead of the party's annual conference in Birmingham, centres on an integrated system combining radar, command and control technology and interceptor missiles designed to protect the UK from increasingly sophisticated airborne threats.

Shadow defence secretary James Cartlidge was due to set out the details in a speech to conference delegates on Tuesday, describing the plan as the most significant upgrade to British air defence in generations.

The Conservatives have framed the project as a British equivalent of Israel's Iron Dome, the multi-layered defensive shield that has intercepted rockets and other projectiles aimed at Israeli territory for more than a decade.

According to the party, Britannia Shield would be built around three interlocking components. The first would be a set of new advanced radar systems capable of detecting incoming threats at greater range and with greater fidelity than existing sensors.

The second element would be upgraded command and control systems, intended to pull together information from across Britain's various defence assets and allow commanders to determine a response quickly.

The third pillar would consist of new interceptor missiles alongside counter-drone capabilities, giving the armed forces additional options for destroying or disabling hostile aircraft, missiles and unmanned aerial vehicles before they reach their targets.

The structure bears a resemblance to the British Army's existing Sky Sabre system, which also operates in layers and can engage munitions and aircraft while feeding into wider air defence networks. Sky Sabre has been deployed by the UK to Poland in support of Ukraine and was sent to the Middle East earlier this year to help defend against Iranian attacks.

The Conservatives argue that the shield would be able to protect critical national infrastructure, military bases and sovereign territories, and they say it would strengthen the country's defences at a moment when Nato allies have repeatedly warned about Russian drone incursions into their airspace.

The party has also pointed to a report published last November by the Commons defence committee, which concluded that the UK was falling behind its European neighbours in planning to defend itself and its overseas territories from military attack.

Cartlidge is expected to tell conference that a £10bn budget would make the programme one of Britain's most significant military undertakings since the Cold War, while insisting such a commitment is necessary given the current threat environment.

The Conservatives say the funding would come from within their existing pledge to raise defence spending to 3% of GDP by 2030, with the money found through welfare reform and the reprioritisation of existing expenditure rather than fresh borrowing.

The announcement lands in the middle of a broader political argument over how quickly Britain should increase its military budget. Prime Minister Andy Burnham has faced pressure to explain how the country will meet Nato's target of spending 3.5% of GDP on defence by 2035, up from an estimated 2.6% this year.

Responding to the Conservative proposal, Defence Secretary Wes Streeting accused the opposition of having an abysmal record on defence during its fourteen years in government, saying the party owed the country an apology rather than another lecture.

Streeting also claimed the Conservatives had cut the Army to its smallest size since the Napoleonic era and left a £17bn hole in the equipment plan, and he cited comments by former defence secretary Ben Wallace, who acknowledged that the armed forces had been hollowed out and underfunded.

The current Labour government's Defence Investment Plan already includes more than £350m to double the number of Sky Sabre systems operated by the British Army, with ground-based air defence positioned alongside air and maritime capabilities in its overall approach.

The exchange sets up air defence as a likely battleground in the next election campaign, with both main parties competing to present themselves as the stronger custodian of national security at a time of heightened geopolitical tension.

If pursued, a programme on the scale of Britannia Shield would also carry significant industrial implications, potentially drawing in British defence manufacturers and their supply chains while raising questions about how quickly new radars and interceptors could be developed and fielded.

The coming weeks are likely to bring further scrutiny of the costing and timetable behind the proposal, as well as pressure on ministers to spell out how their own air defence plans will keep pace with the threats Nato members have been warning about.