The UK's 2.5%-of-GDP defence commitment looked aspirational when first announced. By mid-2026 it has crossed into mechanical execution — a multi-year capex programme spanning shipyards, missile production, nuclear submarines and ammunition replenishment that is on track to be the single largest public investment programme in the UK since the post-war housing era. The supply-chain visibility for the listed UK defence primes is now measured in decades, not years.
Key takeaways
- UK defence capex is now mechanically tracking the 2.5% commitment.
- Order backlog at the listed primes is at record highs.
- Shipyards, missiles and nuclear are the three largest capex categories.
- The export-financing dimension has become structurally important.
Why the scale is generational
The combination of conventional rearmament, AUKUS-driven nuclear capex, and missile inventory replenishment produces a capex schedule unmatched in the post-Cold War period. The supply chain has had to expand to absorb the orders.
- BAE Systems: backlog at record high
- Rolls-Royce defence: AUKUS-driven multi-decade visibility
- Babcock: shipyard capex
- Smaller-cap suppliers: broadly benefiting
The fiscal dimension
The 2.5% commitment is now baked into multi-year fiscal envelopes. Reversal is politically very hard. The investment is being funded through long-dated gilts, which the market has absorbed without strain.
The export dimension
UK defence exports — particularly to Gulf and South-East Asian buyers — are running at multi-year highs.
The supply chain bottleneck
Skilled labour, particularly nuclear-cleared engineers, is the binding constraint.
UK defence capex trajectory
| Fiscal year | Defence spending (% of GDP) |
|---|---|
| FY 2022 | 2.1% |
| FY 2024 | 2.3% |
| FY 2026 | 2.5% |
| FY 2028E | 2.7% |
UK defence has crossed from cyclical theme into generational capex programme.
Frequently asked questions
Is the 2.5% commitment durable?
Yes, mechanically and politically.
What's the binding constraint?
Skilled labour, not capital.
Who benefits beyond the primes?
Mid-cap suppliers and shipyards.
The bottom line
UK defence capex is a multi-decade structural programme. The listed primes are the obvious expression.
