On 9 May 2015, "Northumberland" was present in St Peter Port for the commemorations marking the 70th anniversary of Guernsey's Liberation. A month later, "Northumberland" moored off Cowes in company with HM Ships and to mark the 200th anniversary of the Royal Yacht Squadron. Celebrations began with a reception and capability demonstration onboard hosted by the Second Sea Lord. Guests included the Duke of Edinburgh, as Admiral of the Royal Yacht Squadron, and foreign royals including King Harald of Norway, Juan Carlos, the former king of Spain and Prince Henrik of Denmark.