HMS Hever Castle (K521) depth on the fuses of the projectiles until the moment of firing. A single Squid-launched attack had a success rate of 25%. The class was also provided with HF/DF and Type 277 radar. "Hever Castle" was ordered on 23 January 1943. The ship, named for Hever Castle in Hever, Kent, was laid down on 29 June 1943 and launched on 24 February 1944. At some point in 1943, the ship was transferred to the Royal Canadian Navy. The corvette, renamed "Copper Cliff" after a suburb of Sudbury, Ontario, was commissioned into the Royal Canadian Navy on 25 February 1944 with
Irene Astor, Baroness Astor of Hever 12 days old), the youngest of four children of military officer Douglas Haig, 1st Earl Haig (1861–1928), and Dorothy Maud Vivian (1879–1939). Her brother was George Haig, 2nd Earl Haig (1918–2009). During World War II she worked for the Red Cross and was also involved in the Girls' Training Corps. She married Gavin Astor, later the 2nd Baron Astor of Hever, eldest son of John Jacob Astor, 1st Baron Astor of Hever (1886–1971), and Violet Mary Elliot-Murray-Kynynmound (1889–1965) on 4 October 1945. She became Lady Astor of Hever when her husband succeeded to the barony on the death of his