The Defence Investment Plan Is Here. Now It's the South West's Moment to Deliver

Swindon's defence manufacturing industry stretches back to the Second World War, when the town built Spitfires that helped secure Allied victory. Today it's a different kind of aircraft rolling off the production line, unmanned and far quieter, but the ambition is much the same: to drive the town's economic revival while strengthening Britain's defences once again. 

That story is playing out in workshops, dockyards and laboratories right across the South West. On 30 June 2026, the Government published the Defence Investment Plan, setting out how £298 billion will be spent on UK defence over the next four years, the largest uplift in defence spending since the Cold War. For a region with deep strengths in aerospace, submarines, marine autonomy and advanced manufacturing, this isn't a moment to hope for a share of the spoils. It's a moment the South West is already part of. 

The South West is central to this plan 

Unlike previous funding announcements that regions have had to lobby their way into, the Defence Investment Plan names South West places and businesses directly: 

1. Plymouth is one of only five Defence Growth Deals funded anywhere in the UK, backed by £250 million of new investment over five years. 
2. Plymouth and Yeovil are two of just five towns chosen for new Defence Technical Excellence Colleges, part of a £182 million national skills package. 
3. Devonport is named for Project Royal Oak, a £26 billion, decade-long naval base upgrade described as the biggest of its kind in 45 years, and for Atlantic Bastion, a £1.5 billion hybrid naval programme combining crewed warships with autonomous vessels. 
4. Leonardo's Yeovil site built Proteus, the UK's first fully autonomous full-size helicopter, cited by name in the plan as one of the world's first aircraft of its kind. 
5. Swindon hosts the new Defence Uncrewed Systems Centre, the Government's national hub for embedding autonomous and drone technology across the Armed Forces, sitting alongside private investment from firms like TEKEVER, which is committing £400 million to its UK operations over five years. 

The plan even confirms that 90% of jobs supported by the Future Combat Air System and Global Combat Air Programme sit outside London and the South East, with the South West named as one of the regions benefiting directly. 

This is a region the Government has already chosen to build around. The task now is converting that recognition into delivery. 

A region built for what the plan asks for 

Look at where the Defence Investment Plan is directing money, and you can see the South West's industrial strength. 

Autonomy and marine technology. Over £5 billion is earmarked for autonomous systems, including £1.5 billion for a Hybrid Navy of crewed and uncrewed vessels. Plymouth is already home to the National Centre for Marine Autonomy, Smart Sound Connect's subsea testing network, and companies like Marine AI, which built the software behind the first unsupported Atlantic crossing by an autonomous vessel. Cornwall's National Drone Hub adds air, surface and sub-surface testing capability that exists nowhere else in the country in one place. 

Nuclear and submarines. Over £20 billion in additional investment is going into the Defence Nuclear Enterprise, whose supply chain already spans 6,000 UK companies and a workforce set to reach 65,000 by 2030. Devonport, run by Babcock, is the only UK site capable of deep submarine maintenance and refuelling across the entire fleet, and sits inside the Submarine Production Alliance alongside BAE, Rolls-Royce and the Ministry of Defence. 

Aerospace. Over £1.1 billion will sustain the Typhoon fleet into the 2040s, alongside continued investment in the Global Combat Air Programme. Leonardo's Yeovil site, the UK's only onshore helicopter designer and manufacturer, sits at the centre of a South West aerospace cluster that is the largest in the UK and second largest in Europe. 

Cyber, sensing and advanced manufacturing. Thales's sites in Templecombe and Plymouth have supplied Royal Navy submarine sonar for over 60 years and are now moving into next-generation SSN-AUKUS work. Around them sits a dense supply chain, from BAE's Dorset and Somerset hubs to specialist manufacturers like Chemring, Norco Composites and Sellectronics, alongside research strength at the Universities of Exeter and Plymouth. 

Turning recognition into delivery 

The opportunity is real, but it won't convert itself. The South West's own case for investment has consistently called for long-term contracting certainty, stronger innovation infrastructure, and clearer recognition of defence as an investable sector.  

The Defence Investment Plan responds to several of these directly. It introduces a new Defence Office for Small Business Growth, targeting a 50% increase in SME spend by 2028. It commits to a "buy British by default" approach in priority sectors. And it sets out a new Defence Finance and Investment Strategy designed to unlock private capital for exactly the kind of scale-ups the South West is producing.  

The pieces are in place. What happens next depends on how quickly the region's businesses, universities and supply chains can organise around the opportunity. 

Business West is ready to help 

Turning this opportunity into growth will take businesses ready to scale, export and compete for contracts at pace, and organisations equipped to help them get there. 

That's exactly what Business West does. In the past 12 months, our team of more than 100 specialists has supported 788 businesses across the region. The impact is tangible and measurable, with £91 million in grants and investment raised and 3,500+ jobs created or safeguarded. 

As the South West positions itself to deliver on the Defence Investment Plan, our team is ready to help businesses navigate what comes next, whether that's securing funding, building export capability, or scaling to meet growing demand. Find out more about Business West Consulting.