Britain’s most powerful nuclear sub enters final build phase

Britain's Dreadnought submarine programme has entered Delivery Phase 4, covering completion, sea trials and certification of the first ballistic-missile submarine before its planned entry into service in the early 2030s. Defence Minister Luke Pollard told Parliament that the same phase will take the second boat to sea trials and advance construction milestones on the third and fourth. BAE Systems is building the submarines at Barrow-in-Furness, with Rolls-Royce supplying nuclear-propulsion components from Derby. Dreadnought, Valiant, Warspite and King George VI will replace the four Vanguard-class submarines sustaining the United Kingdom's continuous at-sea nuclear deterrent.