After spending Christmas at Grand Harbour, "Duchess" sailed from Malta on 1 January 1957 with sister ships and , bound for Portsmouth. After a three-month maintenance docking, "Duchess" was assigned to the Home Fleet. On 17 May, "Duchess" and "Diamond" sailed to meet the Royal Yacht "Britannia" at the River Humber. "Britannia" was conveying Queen Elizabeth II and Prince Philip, Duke of Edinburgh to Denmark for a state visit. The two destroyers accompanied the royal yacht to Copenhagen, then back to the Moray Firth at the visit's conclusion. On 28 May, the destroyers rejoined the Home Fleet for a fleet review. The destroyers were then assigned to escort the carrier , with the three ships departing on 30 May for the International Naval Review at Hampton Roads in the United States. The review occurred on 12 June, after which "Duchess" sailed to Bermuda, then back to the United Kingdom. On her return, the ship visited Liverpool for the 750th anniversary of King John's Charter founding the city, then proceeded to Portsmouth. On 27 August, "Duchess" paid off and was recommissioned.