Defence Secretary Philip Hammond will announce a £350 million upgrade of the HMS Vengeance tomorrow, he is expected to say:
"As well as securing 2,000 UK jobs, this contract will ensure the nuclear deterrent submarine fleet can continue to operate safely and effectively to maintain a continuous at sea deterrent.
"As we stabilise the defence budget we are increasingly able to commit to equipment projects to safeguard the UK's National Security. Devonport Dockyard is at the heart of maintaining and supporting the Royal Navy and I am pleased that such a large number of jobs will be protected.
"Our White Paper published earlier this year said we would support key sovereign capabilities in British companies that help us to protect our national security and this contract with Babcock is evidence of that commitment."
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