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The MoD have released pictures of the successful launch of an unarmed Trident ballistic missile by HMS Vigilant during a test launch in the Atlantic Ocean last week.
Nick Clegg accused Defence Secretary Philip Hammond of "jumping the gun" on Trident, as coalition tensions grow over the future generation of British nuclear-armed submarines.
The Deputy Prime Minister dismissed suggestions that an additional £350 million of funding announced for designing a replacement deterrent "made clear" the Government's commitment to maintaining the system.
Mr Clegg insisted the coalition agreement will not be "undermined or contradicted" and the Liberal Democrats' review into alternatives will continue.
A senior Liberal Democrat source said:
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
Defence Secretary Philip Hammond is expected to announce an additional £350 million-worth of funding for the next stage of designing the future generation of British nuclear-armed submarines.
The Ministry of Defence said that the investment will sustain 1,200 UK jobs and follows the initial £350 million of design work announced earlier this year.
Latest ITV News reports
The Defence Secretary has pledged an extra £350 million-worth of trident funding - meaning £700m has been spent on the project this year.