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Defence Nuclear Organisation
BERJAYA
Agency overview
Formed2016[1]
JurisdictionUnited Kingdom
Headquarters
EmployeesOver 450
Minister responsible
Agency executive
  • Madelaine McTernan, Chief of Defence Nuclear
Parent agency
Ministry of Defence
Websitewww.gov.uk/government/organisations/defence-nuclear-organisation

The Defence Nuclear Organisation (DNO) is one of the seven top level budget holders within the United Kingdom's Ministry of Defence (MOD). The organisation was formed in 2016, in order to oversee the MOD's nuclear enterprise.

Staff are primarily based at the organisation's headquarters in the MOD Main Building in Whitehall, with over 300 staff also based at MOD Abbey Wood in Bristol, RNAD Coulport in Argyll, and the Atomic Weapons Establishment near Reading.[2]

Functions

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The Defence Nuclear Organisation primarily serves to oversee the Ministry of Defence's Defence Nuclear Enterprise, which in particular provides the United Kingdom's continuous at sea deterrent.[3]

Defence Nuclear Enterprise

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The Defence Nuclear Enterprise (DNE) consists of the Submarine Delivery Agency, the Atomic Weapons Establishment, the nuclear-related costs of parts of the Military Strategic Headquarters particularly in the Royal Navy, together with the main industrial partner companies including BAE Systems Submarines, Rolls-Royce Submarines and Babcock International which build and maintain the submarines.[4][5] This includes, the scientific research surrounding the nuclear program, the delivery of nuclear warheads, providing appropriate infrastructure for the program, and disposing of nuclear assets.[2]

About 20% of the MOD budget was spent on the DNE in 2025–26, as a ring-fenced budget, with a projection that this proportion will continue to increase to between 20% and 25% of the MOD budget.[5]

The nine most costly DNE programmes, each of which has a whole-life cost exceeding £10 billion, are:[6][7]

In 2024, a Public Accounts Committee report on sound financial practice identified a gap in parliamentary scrutiny of the Defence Nuclear Enterprise. The government responded in 2026, suggesting the establishment of a new House of Commons Committee to conduct scrutiny of DNE expenditure and programmes. Given the classified nature of this topic, the committee would be appointed by the prime minister and report substantive findings privately to the prime minister and defence secretary only.[8]

References

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  1. ↑ "House of Commons Committee of Public Accounts – Ministry of Defence nuclear programme – Sixty-First Report of Session 2017–19" (PDF). p. 10. Retrieved 25 March 2021.
  2. 1 2 "About us – Defence Nuclear Organisation". Ministry of Defence. Retrieved 26 March 2021 – via gov.uk.
  3. ↑ "House of Commons Committee of Public Accounts – Ministry of Defence nuclear programme – Sixty-First Report of Session 2017–19" (PDF). p. 6. Retrieved 26 March 2021.
  4. ↑ "About us – Defence Nuclear Enterprise". Ministry of Defence. Retrieved 3 July 2026 – via gov.uk.
  5. 1 2 "MoD follow-up Spring 2026". Public Accounts Committee. UK Parliament. 7 June 2026. pp. 11–12. HC 95. Retrieved 12 June 2026.
  6. ↑ Pollard, Luke (8 June 2026). "Defence Nuclear Enterprise". Hansard. UK Parliament. UIN 7775. Retrieved 12 June 2026.
  7. ↑ "Defence Nuclear Enterprise 2025 Annual Update to Parliament". Ministry of Defence. 22 May 2025. Retrieved 12 June 2026 – via gov.uk.
  8. ↑ Healey, John; Campbell, Alan (3 June 2026). "Government response to the PAC joint letter - Parliamentary scrutiny of Defence Nuclear Enterprise". Ministry of Defence. AC/NMP1447. Retrieved 7 July 2026.
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