Defence Investment

The regime is operational but materially incomplete. The Strategic Defence Review was endorsed in June 2025 with all 62 recommendations accepted 12, and the Defence Industrial Strategy followed in September 2025 34. The two key machinery changes — the National Armaments Director Group and UK Defence Innovation — are both stood up, with UKDI launching its £140m first-year drone and counter-drone investment programme in December 2025 5. Five Defence Growth Deals (£50m each) have been launched in sequence between February and April 2026: Wales (autonomy), Scotland, South Yorkshire, Plymouth/SW and Northern Ireland 6. Procurement-law plumbing has shifted: the Defence and Security Public Contracts (Amendment) (EU Exit) Regulations 2020 were revoked on 24 February 2025 by SI 2025/163, leaving the DSPCR 2011 sitting alongside the Procurement Act 2023. What is absent is the operative capital-allocation document. The Defence Investment Plan — described by John Healey as a 10-year, zero-based review of Defence's budgets, the first in eighteen years 7 — has slipped past every signalled window, with the Lords pressing on the delay 8 and three written questions about DIP progress going unanswered before prorogation 91011. Munitions-factory delivery has moved from headline 'building factories' 12 to 'contracting feasibility studies' in spring 2026 1314.

In the last 90 days the regime has been characterised by sustained pressure on DIP publication and increasingly granular scrutiny of programme inclusion. The joint PAC and Defence Committee Chairs' letter of 28 January 2026 to the Permanent Secretary on DIP transparency 12 — a rare cross-committee escalation — was followed by the Permanent Secretary's reply on 4 February 3, the Defence Committee Chair's 3 March letter to the Secretary of State 4 and the SoS's response on 13 March 5. At Commons OQs on 16 March 2026, Shastri-Hurst, Roome, Obese-Jecty, MacCleary, Charters and Cartlidge in turn pressed the SoS on DIP timing, internal sign-off, the DFIS gap and purdah constraints 6789. The Energetics Investment Information Notice was issued on 2 April 2026, with the MOD subsequently confirming that feasibility studies conclude in August 2026, investment decisions are announced in Q3 2026 and first construction begins before end-2026 1011. The Northern Ireland Defence Growth Deal was launched on 22 April 2026 12, completing the five-deal pattern set by the DIS. The Permanent Secretary wrote a sequence of letters to PAC on 20 April 2026 covering the MOD Annual Report and Accounts, F-35 capability, Reserve Forces and Afghanistan Response Route 13141516.

Three things will determine whether the regime stabilises in 2026. First, DIP publication itself: it is the canonical reference for everything from minesweepers 1 to the New Medium Helicopter 2 to Proteus 3 to RAF Wyton infrastructure 4, and its continued absence freezes industrial planning across the supply chain — a risk Defence Committee witnesses have raised explicitly 567. Cartlidge's warning at 16 March OQs 8 that purdah pushes publication into May has now become probable rather than hypothetical given prorogation. Second, munitions-factory delivery: the headline commitment is six factories backed by £1.5bn 9; the corpus now shows the timeline as feasibility studies (Apr-Aug 2026), investment decisions (Q3 2026) and construction starts (end 2026) 1011. Slippage on any of those three steps directly exposes the SDR's most-quoted concrete capability commitment. Third, the independent audit baseline: the NAO has an open work-in-progress study on affordability 12, the Defence Committee's Affordability of the DIP inquiry is live 13, and the NAO's qualified opinion on the MOD 2024-25 Accounts 14 gives both committees an anchor for value-for-money critique. Secondary watch items: the still-missing Defence Finance and Investment Strategy 158, the annual SME Action Plan and direct SME spending target 1617, the Infrastructure Recapitalisation Plan under SDR Recommendation 59 18, the Defence Readiness Bill flagged in the SDR 8, and whether retail or 'defence' bonds emerge as a financing tool 192021.

The structural risk is that the DIP is the document everything else points to; it has been promised since the SDR's publication in June 2025 1 and has now been outstanding for more than nine months, with the Lords explicitly asking why publication has been delayed 2. Inferred from corpus gap: the NAO's audit on Investment Plan affordability is listed as work-in-progress 3 but no completed NAO report sits on this thread, so the independent value-for-money baseline is not yet established. The cost of accepting all 62 SDR recommendations has been deferred by ministers to 'the DIP will provide a comprehensive overview' 4 rather than answered. The DE&S/NAD/UKDI machinery has been restructured rapidly in 2025 567; transition risk during a zero-based capital re-plan is genuine but not surfaced in any single document. Foreign investment in the industrial base (Navantia/Harland & Wolff, Boeing/Spirit, Airbus/A220 wings) is not addressed via NSI machinery in the events on this thread. Finally, the SDR's 2.5% trajectory and the Treasury's 2.6% by 2027-28 sit alongside a NATO 5% by 2035 commitment without a published reconciliation case — the live fiscal-credibility question.