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 during which time it was leased to various private tenants. In 1903, it was acquired and restored by the American millionaire William Waldorf Astor, who used it as a family residence. He added the Italian Garden to display his collection of statuary and ornaments. In 1983, the Astor family sold the castle to Broadland Properties Limited, which is run by the Guthrie family. Hever Castle is now a tourist attraction, drawing on its links to Anne Boleyn and Henry VIII, its mazes, gardens and lake. There is an annual events programme with assorted events, including jousting tournaments and archery displays