The announcement followed the successful firing of an unarmed Trident ballistic missile by HMS Vigilant during a test launch in the Atlantic Ocean last week, according to the the MoD.
HMS Vigilant is one of four Vanguard Class submarines which maintain the UK's nuclear deterrent.
The Vanguard submarines will be replaced from 2028 by the Successor which is currently being designed by British companies.
As a result of this latest announcement, BAE Systems will proceed with an additional £315 million worth of work, with a further £38 million carried out by engineering support services company Babcock
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As many as 2,000 British holidaymakers could be among those stuck at emergency accommodation as snow causes chaos for holidaymakers.
Tributes have beenb paid to Harry Potter and Outnumbered actor David Ryall who died on Christmas Day aged 79.
We are set to enjoy some sunshine after all that ice, snow and frost - albeit with temperatures still low.