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The renewal of Trident has major financial and political implications
The government is considering delaying the replacement of the Trident nuclear deterrent, the BBC has learned.
Ministers will decide shortly what kind of deterrent Britain should have and can afford alongside the current comprehensive spending review.
But they are now looking at postponing key spending decisions on Trident until after the 2015 election, potentially saving billions in the short term.
The Ministry of Defence said that no decisions had been taken.
Delaying any decision beyond 2015 would also mean avoiding a political row in the run-up to the next general election.
While the Conservatives strongly support Trident renewal, the Liberal Democrats do not and it remains one of the few disagreements left unresolved by the coalition agreement.
Britain's nuclear deterrent is made up of four submarines, based at the Faslane naval base on the Clyde, which can deploy Trident ballistic missiles carrying nuclear warheads.
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At least one submarine is always at sea so a continuous deterrent can be maintained.
The government is already spending lots of money on potential plans and possible designs for new submarines that would deliver the Trident missiles.
The main, final decision to go ahead and build the new submarines was expected to be taken in 2014. This is known in military jargon as the "main gate" decision, the point of no return when ministers sign contracts and start spending billions of pounds.
However, ministers are now looking at pushing this "main gate" decision into the next parliament, in 2015 or beyond.
Any delay would ease the short-term pressure on the defence budget which is facing substantial cuts under the spending review.
Critics say delaying spending money on replacing Trident will cost the taxpayer more in the long run as it will risk losing the skills of engineers who might lose their jobs if there is no work for them, and will increase the costs of repairing existing Vanguard submarines which will have to last for longer.
Treasury Minister Justine Greening told the BBC's Newsnight that she could not prejudge the outcome of next month's spending review but there would inevitably be difficult decisions.
Former Labour defence minister Lord West told the same programme that ministers must make clear what any potential delays would relate to.
"Are they saying they will stop all work on replacing the submarines?" he said, adding that such a move could be "dangerous" given the need to maintain a continuous seaborne presence.
In a report published on Wednesday, MPs urged ministers to clarify how a replacement for Trident - which it is estimated could cost up to £20bn - will be funded.
The Treasury has made clear that the Ministry of Defence will have to cover the cost from its own budget, which is facing reported cuts of between 10% to 20% over the next four years.
Responding to the report, Lib Dem Defence Minister Nick Harvey said there were "big debates" to be had about the cost of renewing Trident - currently the subject of a value for money exercise.
But he insisted this would not impact on the current spending round - the details of which will be announced next month - as the bulk of expenditure will be after 2015.
This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.
The renewal of Trident has major financial and political implications The government is considering delaying the replacement of the Trident nuclear deterrent, the BBC has learned.
Ministers will decide shortly what kind of deterrent Britain should have and can afford alongside the current comprehensive spending review.
But they are now looking at postponing key spending decisions on Trident until after the 2015 election, potentially saving billions in the short term.
The Ministry of Defence said that no decisions had been taken.
Delaying any decision beyond 2015 would also mean avoiding a political row in the run-up to the next general election.
While the Conservatives strongly support Trident renewal, the Liberal Democrats do not and it remains one of the few disagreements left unresolved by the coalition agreement.
Britain's nuclear deterrent is made up of four submarines, based at the Faslane naval base on the Clyde, which can deploy Trident ballistic missiles carrying nuclear warheads.
Related stories
At least one submarine is always at sea so a continuous deterrent can be maintained.
The government is already spending lots of money on potential plans and possible designs for new submarines that would deliver the Trident missiles.
The main, final decision to go ahead and build the new submarines was expected to be taken in 2014. This is known in military jargon as the "main gate" decision, the point of no return when ministers sign contracts and start spending billions of pounds.
However, ministers are now looking at pushing this "main gate" decision into the next parliament, in 2015 or beyond.
Any delay would ease the short-term pressure on the defence budget which is facing substantial cuts under the spending review.
Critics say delaying spending money on replacing Trident will cost the taxpayer more in the long run as it will risk losing the skills of engineers who might lose their jobs if there is no work for them, and will increase the costs of repairing existing Vanguard submarines which will have to last for longer.
Treasury Minister Justine Greening told the BBC's Newsnight that she could not prejudge the outcome of next month's spending review but there would inevitably be difficult decisions.
Former Labour defence minister Lord West told the same programme that ministers must make clear what any potential delays would relate to.
"Are they saying they will stop all work on replacing the submarines?" he said, adding that such a move could be "dangerous" given the need to maintain a continuous seaborne presence.
In a report published on Wednesday, MPs urged ministers to clarify how a replacement for Trident - which it is estimated could cost up to £20bn - will be funded.
The Treasury has made clear that the Ministry of Defence will have to cover the cost from its own budget, which is facing reported cuts of between 10% to 20% over the next four years.
Responding to the report, Lib Dem Defence Minister Nick Harvey said there were "big debates" to be had about the cost of renewing Trident - currently the subject of a value for money exercise.
But he insisted this would not impact on the current spending round - the details of which will be announced next month - as the bulk of expenditure will be after 2015.
This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.