Pressure is growing on defence ministers, who appear to have ruled out including Trident in their strategic review. The Lib Dems have been accused of accepting Tory policy on the issue.

The Campaign for Nuclear Disarmament have said that some constituencies have become “Trident marginals”, in which a closely fought contest involves different views on the issue.

The people of Wales need to know where the Liberal Democrats really stand on nuclear weapons, says a Plaid Cymru candidate who is challenging them to "come clean".

A senior Liberal Democrat has said his party may choose to scrap all the UK's nuclear weapons, suggesting a different emphasis to party leader Nick Clegg's focus on a cheaper alternative to Trident.