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Trident Missiles

Ministry of Defence written question – answered on 17th June 2016.

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Photo of Steven Paterson Steven Paterson Scottish National Party, Stirling

To ask the Secretary of State for Defence, what the budget is of the Mk4A upgrade programme.

Photo of Steven Paterson Steven Paterson Scottish National Party, Stirling

To ask the Secretary of State for Defence, what the goal is of the Mk4A upgrade programme.

Photo of Steven Paterson Steven Paterson Scottish National Party, Stirling

To ask the Secretary of State for Defence, whether the Mk4A upgrade is expected to increase the yield of the warhead.

Photo of Steven Paterson Steven Paterson Scottish National Party, Stirling

To ask the Secretary of State for Defence, when work on the Mk4A upgrade programme began.

Photo of Steven Paterson Steven Paterson Scottish National Party, Stirling

To ask the Secretary of State for Defence, when the Mk4A upgrade is planned to come into service.

Photo of Steven Paterson Steven Paterson Scottish National Party, Stirling

To ask the Secretary of State for Defence, what forecast he has made of by how long the Mk4A upgrade programme will extend the operational life of the current warhead.

Photo of Philip Dunne Philip Dunne Minister of State (Ministry of Defence) (Defence Procurement)

The UK currently fields the Trident Mk4 warhead as part of the Trident Strategic Weapons System. In order to ensure continuity of the Mk4-based capability, the Mk4A Arming, Fuzing and Firing system is a non-nuclear component being introduced into the UK Trident warhead to replace a similar component. The Mk4A programme will not increase the destructive power of the warhead.

Approval to procure the new Arming, Firing and Fuzing mechanisms, to manage obsolescence in Mk4 and to adopt a Mk4A component was given in January 2006. I am withholding further details of the date of the Mk4A component's entry into service, the cost of the Mk4A programme and the extension in operational life expected for the purposes of safeguarding national security.

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