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
More top news
More than 50 firefighters were called in the early hours of this morning after a car ploughed through a shop window and burst into flames.
The six-time Olympic gold medallist has been forced to pull out of the Jamaican National Championships after suffering a hamstring tear.
The character's death will send shockwaves through Weatherfield.