UK Nuclear Deterrent

James Cartlidge Excerpts

Monday 2nd June 2025 Commons Chamber

[Mr Speaker]

I call the shadow Secretary of State, James Cartlidge.

[James Cartlidge (South Suffolk) (Con)]

I am grateful to the Chair of the Defence Committee for securing this important urgent question. Following comments in the press last month from Sir Simon Case, former head of the civil service, that the UK should consider air-launched nuclear capabilities, I wrote in the Express on 25 May that our nuclear deterrent needed to be made even more resilient, including the continuous at-sea deterrent, but also

“potentially, by diversifying our methods for delivering nuclear strike.”

I believe that it would be right to diversify our methods of delivering nuclear strike, because we have to recognise the threat posed by Russia in particular, and it has the ability to operate nuclear weapons at tactical and theatre levels. To deter effectively, we must be able do the same.

We support in principle moves to widen our nuclear capabilities, on the assumption that we do so working closely with our NATO allies. However, I gently suggest to the Government that they may need our support to carry that decision. I remind the Minister that eight of his Front-Bench colleagues voted against the renewal of our nuclear deterrent in 2016, including the Deputy Prime Minister, the Foreign Secretary, the Secretaries of State for Scotland and Wales, the Under-Secretary of State for Foreign, Commonwealth and Development Affairs, the hon. Member for Hornsey and Friern Barnet (Catherine West), and others. If the Minister was hoping that he could rely on the Liberal Democrats, let me say that not only did all but one of their MPs vote against Trident renewal in 2016, but as a condition of supporting the coalition Government, they shamefully demanded that we delayed the renewal of our nuclear submarines, leaving us to rely on older boats for far longer. That led to longer maintenance periods, and above all, directly contributed to the punishingly long tours of duty for our CASD naval crews.

Having had the privilege of serving as the Minister responsible for nuclear, and having chaired the Defence Nuclear Board, I understand why the Minister needs to choose his words carefully, but can he at least recognise that 204 days for a patrol is far too long, and that in addition to any plan to diversify the deterrent launch method, we must ensure that our strategic CASD enterprise has an effective and productive industrial base, delivering faster maintenance times? Finally, will he confirm what the estimated cost will be of delivering an air-launched option, and say by when he would expect that to be in service?

[Luke Pollard]

Let me again put on record my thanks to all members of our Royal Navy who go out on patrol, not just on our Vanguard-class submarines, but also on our Astute-class boats—and the previous T-class boats—that defend our deterrent while at sea. They guarantee our security by ensuring that there is a continuous at-sea nuclear deterrent every day, and have done so for over 70 years. Every Labour Member was elected on a manifesto commitment to a triple lock for our nuclear submarines: first, we will continue to support the continuous at-sea nuclear deterrent; secondly, we will build four Dreadnought-class nuclear submarines at Barrow, which we are committed to delivering; and thirdly, we will maintain and provide all the upgrades that are required for the continuous at-sea nuclear deterrent. That includes the renewal of our sovereign warhead, which the Defence Secretary will get to when he makes his statement on the strategic defence review later today. I am determined that we will guarantee our national security, and we will work across Government to do so.