5MAR

UK reopens War Book, hosts 30-nation Hormuz meet

4 min read

04:57UTC

The UK's Chief of the Defence Staff confirmed Whitehall is rebuilding the Cold War Government War Book, citing the Iran conflict as a driver alongside Ukraine. Three days later the MoD hosted 30 nations at Northwood to plan the Strait of Hormuz.

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ConflictDeveloping

Key takeaway

The War Book is back; the planning conference it runs alongside is about Hormuz, not Moscow.

Air Chief Marshal Sir Richard Knighton, the UK's Chief of the Defence Staff since September 2025, told Sky News at the London Defence Conference on Friday 10 April that Whitehall is rebuilding the Government War Book, a Cold War civil-mobilisation framework covering military, police, industry and hospitals that was scrapped in the early 2000s ¹. Knighton cited "the ongoing conflict between the US, Israel and Iran" as a driver alongside Ukraine. The Cabinet Office leads the framework, coordinating the military, police, industry and NHS trigger chains. On Wednesday 22 April the Ministry of Defence hosted a 30-nation Strait of Hormuz military planning conference at Permanent Joint Headquarters Northwood in Middlesex, the UK's operational command centre, co-chaired by Defence Secretary John Healey with France; the remit covered mine clearance, freedom of navigation and protection of merchant shipping ². The MoD statement did not mention Ukraine or Russia.

The Ukraine supply line continues to run separately. On 15 April the MoD confirmed cumulative UK drones supplied to Ukraine had crossed 120,000 units and announced a £900 million contract for Army Apache and RAF Chinook maintenance. The 22 April Northwood planning did not touch it.

Two serving and former officers publicly graded the procurement base underneath as thin. General Sir Richard Barrons, former commander of Joint Forces Command, told CNBC on 22 April that "today's army can frankly do one very small thing" ³. The same report cited a £28 billion decade-long funding gap and the Ajax armoured vehicle programme's record of £6.3 billion spent against 165 of 589 vehicles delivered. Lord Robertson, commissioned by Prime Minister Starmer to review the armed forces, accused the government of "corrosive complacency". The Civil Contingencies Act 2004 and associated emergency-powers statutes have not been exercised against anything resembling the threat mix Knighton is now citing. Two allies moved on the same Wednesday: Berlin published a Russia-facing doctrine naming the Bundeswehr's 2029 readiness deadline on the same day Whitehall's operational HQ ran the Gulf scenario. The Germany-Ukraine €4bn defence package signed on 14 April set the procurement baseline Pistorius now frames doctrinally; Britain has reopened a civil-mobilisation binder across a £28 billion funding gap.

Deep Analysis

In plain English

The Government War Book is a British planning document, last maintained during the Cold War, that sets out what the government would do in a major national emergency: how to requisition hospitals, direct industry, deploy police, and mobilise the military. It was scrapped in the early 2000s when planners assumed large-scale war in Europe was no longer a realistic scenario. Air Chief Marshal Sir Richard Knighton, the UK's top military officer, announced on 10 April that Britain is rebuilding it. Twelve days later, the UK hosted representatives from 30 countries at its operational command centre in Northwood, north of London, to plan how to keep the Strait of Hormuz open: the narrow waterway through which a fifth of the world's oil passes. Both moves signal that the UK is treating multi-front military contingency as a live planning requirement, not a theoretical one.

Deep Analysis

Root Causes

The War Book's abandonment in the early 2000s reflected a structural assumption: that NATO collective defence made national mobilisation planning redundant, since any large-scale conflict would involve allied burden-sharing. Russia's 2022 full-scale invasion exposed that assumption as incorrect not because NATO failed but because the timeline for allied mobilisation (weeks to months) and the timeline for a rapid Russian fait accompli (days) are incompatible.

The Hormuz planning conference at Northwood reflects a second structural gap: the UK's carrier strike group was not available for Middle East deployment for three weeks after hostilities began between the US, Israel, and Iran, because HMS Prince of Wales was in refit. A single carrier nation lacks redundancy. The 30-nation conference format attempts to aggregate capability that no single European navy retains independently.

Source Landscape

This story draws on mixed-leaning sources from United Kingdom and United States

United Kingdom

United States

Primary parallel: The UK's original Government War Book was compiled during the First World War and maintained through the Cold War, covering military mobilisation, police emergency powers, hospital requisitioning, and industrial direction. It was formally stood down in the early 2000s following the 1998 Strategic Defence Review's post-Cold War reorientation.

The decision to scrap it in 2004 followed the assumption, embedded in the 2003 Goldsmith legal advice on Iraq, that future UK military engagements would be expeditionary and coalition-based rather than national mobilisation events. Knighton's revival confirms that assumption has been retired.

Counter-parallel: Australia's 2020 Strategic Defence Update reactivated its own mobilisation planning framework in response to regional threat assessment changes, including a 2030 force structure review.

The Australian process was funded and resourced from the start; the UK's War Book revival was announced before any Treasury commitment to the resources required to operationalise it, suggesting the British process may follow the announcement-without-resourcing pattern that produced the Ajax failure.

Consensus view: Lord Robertson, commissioned by the Starmer government for a root-and-branch armed forces review, accused the UK government of 'corrosive complacency' on defence.

General Sir Richard Barrons, former Commander of UK Joint Forces Command, told CNBC that 'today's army can frankly do one very small thing': a direct reference to the capability gap opened by £28 billion in decade-long underfunding and the Ajax armoured vehicle programme failure (£6.3 billion spent against 165 of 589 vehicles delivered). The War Book revival and Northwood conference represent institutional planning activity, not restored capability.

Counter-view: The Henry Jackson Society argues Knighton's War Book announcement should be read as a political pressure instrument as much as an operational plan: by using 'War Book' language in public, the CDS creates a justification for the Treasury to release defence funds that it has resisted handing to the MoD over procurement failures. The announcement is the beginning of a budget negotiation, not the end of a planning process.

Key tension: Knighton cited both the Iran conflict and Ukraine as drivers for the War Book revival; the Northwood conference was solely focused on Hormuz mine clearance and freedom of navigation. Whether the UK's actual operational planning prioritises the Iran theatre over the Russia-Ukraine theatre: or whether the institution is genuinely dual-tracking: remains unresolved.

First Reported In

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Sky News· 24 Apr 2026

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Causes and effects

Caused by

Carnegie: Iran war masks Kyiv's oil strike cost

UK Hormuz planning is framed as the same economic logic in reverse: if Hormuz reopens, oil prices fall and Russia's fiscal squeeze tightens.

Occurred 22 Apr 2026

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This Event

UK reopens War Book, hosts 30-nation Hormuz meet

Britain is reactivating a Cold War civil mobilisation framework while its operational headquarters runs an Iran scenario, revealing which theatre Whitehall is actually planning for.

Different Perspectives

Oil markets / Lloyd's underwriters

Futures markets priced CENTCOM's strikes-complete statement as a de-escalation signal and pushed Brent down 1.7 per cent to $94.71, even as the IRGC declared Hormuz closed. Lloyd's war-risk premiums held elevated because institutional de-listing requires a UN Security Council resolution that Russia and China have just shown they will block.

Pakistan (mediator)

Interior minister Mohsin Naqvi carried dual civilian and military letters to Mojtaba Khamenei in Tehran on 6-7 June with no public response. The IRGC's Hormuz closure on 11 June shows the corps is acting independently of the channel Pakistan is using, making the mediation structurally unable to produce a binding commitment without direct IRGC access.

Russia and China

Russia and China voted against GOV/2026/40 at the IAEA Board, following through on the blocking position coordinated with Grossi in Geneva on 5 June; both states continue to oppose Western institutional pressure on Iran at every multilateral venue.

E3 and IAEA (UK, France, Germany)

The E3 co-sponsored IAEA resolution GOV/2026/40, adopted 21-3-10 on 10 June, demanding Iran disclose 440.9 kg of unaccounted HEU and admit inspectors to four denied facilities. The 10 abstentions and Russia-China noes leave any Security Council referral without a viable enforcement path.

IRGC / Iran military command

The corps declared Hormuz closed to all traffic on 11 June and claimed two vessels struck, overriding the MoU its own civilian negotiators were pursuing through Pakistan. The closure order used the Persian Gulf Strait Authority apparatus to convert a toll mechanism into a military prohibition.

Trump administration / CENTCOM

CENTCOM completed a second day of strikes on Tehran, Sirik and Minab, rejected the IRGC Hormuz closure as inconsistent with observed transit, and said strikes were complete. Hegseth framed the bombing explicitly as the negotiation: the method is coercive deal-making with no stated pause threshold.