Defence: Continuous At-sea Deterrence

Lord West of Spithead Excerpts

Wednesday 23rd June 2021 Lords Chamber

[Baroness Goldie (Con)]

Yes, I can confirm to my noble friend that, to maintain the credibility of the deterrent and the minimum destructive power needed to guarantee that it does remain credible and effective against a whole range of state nuclear threats from any direction, an assessment has been made. The UK will move to an overall nuclear weapons stockpile of no more than 260 warheads—an increase of 15% from the previous ceiling of 225. I make it clear this is neither a target nor the current number of warheads, but it represents the upper limit of what we think we might need to maintain the credibility of the deterrent.

[Lord West of Spithead (Lab)]

My Lords, for over 50 years, the submarine-based nuclear deterrent has ensured peace and acted as the ultimate guarantor of our nation’s security against nuclear blackmail. Those involved in this complex, difficult and continuous enterprise deserve our thanks. Does the decision to run the Vulcan Naval Reactor Test Establishment at Dounreay in Scotland for three years longer than planned, to meet

“the need to support the extended scope of the operational work”,—[Official Report, Commons, 17/6/21; col. 101WS.]

mean that it is related to the life extension of the Vanguard class? As the PWR2 reactor will be running innumerable submarines for many more years, has there been any reassessment of the Royal Navy reactor prototype review of 2015 to see whether Vulcan should remain operating even longer?

[Baroness Goldie (Con)]

As the noble Lord will be aware, we are conscious of the obligations of seeing through the transition from the existing class of nuclear-armed submarines to the new Dreadnought class. That Dreadnought submarine programme remains on track to enter service in the early 2030s. There will be no compromise to the UK’s continuous at-sea deterrent. On the specific points he raises, he will understand I am unable to release specific information about supply, support and logistics. But we are satisfied that our continuous at-sea deterrent is operating effectively now and discharging all its tasks and, in the transition and beyond, will continue to do that.