Conservatives unveil £10bn 'Britannia Shield' plan to overhaul UK air defences

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

The proposal, announced ahead of the party's annual conference in Birmingham, would fund a layered system combining advanced radar, upgraded command and control technology, and new interceptor missiles alongside counter-drone capabilities.

Shadow defence secretary James Cartlidge was due to present the plan to conference attendees on Tuesday, describing it as the most significant upgrade to British air defence in generations. He was expected to argue that the scale of the investment would make it one of the country's largest military programmes since the Cold War, and that such spending is unavoidable given the current threat environment.

The Conservatives have characterised the initiative as a British equivalent of Israel's Iron Dome, the multi-layered air defence system that has intercepted rockets and other projectiles for years. According to the party, Britannia Shield would be designed to protect critical national infrastructure, military bases and sovereign territories from sophisticated modern threats.

The leadership pointed to repeated warnings from Nato allies about Russian drone incursions into allied airspace as evidence of the need for stronger domestic defences. It also referenced a report published last November by the Commons defence committee, which concluded that the UK was falling behind its European neighbours in planning how to defend itself and its overseas territories against military attack.

Under the Conservative blueprint, the system would rest on three pillars. The first would be a new generation of advanced radar systems capable of detecting incoming threats at greater range and with more precision. The second would be an overhaul of command and control infrastructure, allowing information gathered across Britain's various defence assets to be fused together so that commanders can decide on a response rapidly. The third component would consist of new interceptor missiles and dedicated counter-drone weapons.

That three-tiered structure mirrors the British Army's existing Sky Sabre system, which is able to intercept munitions and aircraft while plugging into broader air defence networks. Sky Sabre has already been deployed overseas in recent years, including to Poland in support of the UK's backing for Ukraine, and to the Middle East earlier this year as part of defensive operations against Iranian attacks.

The Conservatives said the £10bn commitment would be absorbed within their existing pledge to raise defence spending to 3% of GDP by 2030, with the money coming from welfare reform and a reprioritisation of current expenditure rather than new borrowing.

The announcement immediately drew a sharp response from Defence Secretary Wes Streeting, who accused the opposition of neglecting Britain's defences during its 14 years in government. He said the Conservatives owed the country an apology rather than another lecture, arguing that they had cut the Army to its smallest size since the Napoleonic era and left a £17bn black hole in the equipment plan. Streeting also cited comments by former Conservative defence secretary Ben Wallace, who acknowledged that the Armed Forces had been hollowed out and underfunded.

The exchange reflects a wider political battle over defence spending that has intensified in recent months. Prime Minister Andy Burnham has faced mounting pressure to explain how the government will meet Nato's target of spending 3.5% of GDP on defence by 2035, up from an estimated 2.6% this year. The current Labour administration's Defence Investment Plan already contains more than £350m earmarked to double the number of Sky Sabre systems operated by the British Army, with ground-based air defence treated as one strand of a broader approach that also covers air and maritime capabilities.

Analysts note that the timing of the Conservative proposal is significant, coming amid growing concern across Europe about airspace security. Germany recently blamed Russia for a drone attack at Leipzig airport, and the UK military has acknowledged jamming the satellites of other nations as part of its own defensive posture. Those developments have pushed air and missile defence up the political agenda across Nato, where members are grappling with the cost of protecting civilian infrastructure and military sites from cheap but disruptive drone technology.

Whether the Conservatives can deliver on the pledge will depend heavily on the outcome of the next election and on the state of the public finances. For now, the plan serves as a clear dividing line between the two main parties on defence, with the opposition framing Labour's record as insufficient and the government countering that the Tories cannot be trusted with national security after more than a decade in power. The coming months are likely to bring further details from both sides, particularly on how the 3% and 3.5% spending targets would be met and what capabilities would be prioritised first.