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
Hever Castle Astor. Geoffrey Boleyn's grandson, Thomas Boleyn, inherited the castle in 1505. He lived there with his wife Lady Elizabeth Howard and their children George, Mary and Anne (the future wife of Henry VIII). It is not known if Anne was born at Hever (the year of her birth is not certain), but she lived there until she was sent to the Netherlands in 1513 to receive an education at the court of the Archduchess Margaret. Henry VIII often used the nearby Bolebroke Castle to conduct his courtship with Anne. The property came into the possession of Henry VIII after the