As my right hon. Friend the Prime Minister stated on 17 March 2009, as soon as it becomes useful for our nuclear arsenal to be included in broader multilateral negotiations, Britain stands ready to participate and to act. A decision now not to renew our Ship Submersible Ballistic Nuclear (SSBN) submarine fleet would pre-empt any such negotiation, by committing a future Government to unilateral disarmament at the end of the current fleet’s lifespan, regardless of the strategic circumstances at that time.