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MPs have voted to approve a motion to renew Trident, the UK's nuclear deterrent.
472 MPs voted in favour of the plans while 117 voted against the motion to replace the four Vanguard class submarines with four new submarines which have been codenamed 'Successor'.
Production of the £40 billion fleet of submarines will take place in Cumbria at the BAE Systems plant in Barrow where 8,000 people are employed.
Barrow is waiting for a vote in Parliament to decide its future as part of the UK's nuclear defence programme.
Almost 8,000 people work at the BAe plant in Cumbria - most of them on the Vanguard-class submarines which carry Trident nuclear missiles.
MPs will vote on whether the UK Government goes ahead with spending up to £50bn on a fleet of new subs codenamed Successor.
- Granada Reports correspondent Amy Welch looks at what the industry means to the region:
Theresa May accused Green MP Caroline Lucas and some Labour MPs of defending the country's enemies, as MPs prepare to vote on renewing Trident.
The MP for Brighton Pavilion had said the UK's nuclear weapons are "driving proliferation - not the opposite", before the prime minister rejected the suggestion, saying: "I have to say to you that sadly you and some members of the Labour Party seem to be the first to defend the country's enemies and the last to actually accept the capabilities that we need."
Mrs May said it is "a great pity" that members of the Labour front bench "fail to see the necessity" of Britain's nuclear deterrent "given that the Labour party in the past has put the British national interest first in looking at this issue."
Speaking in the Commons, the prime minister added that we "cannot afford to relax our guard" and "need to be prepared to deter threats to our lives and our livelihoods."
The Labour leader Jeremy Corbyn has questioned the effectiveness of Trident, as MPs prepare to vote on renewal of Britain's nuclear deterrent.
Speaking in the Commons, he said: "What is the threat that we are facing that over a million people's deaths actually deters?
"It's not from the so-called Islamic State - their poisonous death cult glories in killing as many people as possible, as we've seen brutally in Syria, to east Africa, from France to Turkey.
"It hasn't deterred our ally, Saudi Arabia, from committing dreadful acts in the Yemen. It didn't stop Saddam Hussein's atrocities in the 1980s or the invasion of Kuwait in 1990. It didn't deter the war crimes in the Balkans in the 1990s, nor the genocide in Rwanda.
"I do not believe the threat of mass murder is a legitimate to go about dealing with international relations."
Latest ITV News reports
Construction work will begin on the successor submarines that carry the controversial Trident missiles, the Defence Secretary has said.
There's clear division over Britain's nuclear deterrent, which carries missiles as powerful as eight Hiroshima nuclear bombs.