Labour: Costs need to be considered over Trident

For Labour, shadow defence minister Kevan Jones said it was "absolutely right and necessary" for the UK to retain an independent nuclear deterrent, but it must take into account the costs involved.

Shadow defence minister Kevan Jones. Credit: Press Assocation

"World events demonstrate that in an unpredictable era our country needs the ultimate security guarantee," he said.

"The precise nature of the deterrent must be judged on meeting military capability requirements and cost."

Read: North Korean army 'given approval' to launch nuclear strike on US threats

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PM: North Korea is threat to UK

David Cameron has warned it would be "foolish" to consider abandoning its Trident deterrent because the UK faces an increased threat of a nuclear attack from regimes including North Korea. He claimed rockets from Pyongyang could hit Britain.