The W and Z class was a class of sixteen destroyers of the Royal Navy launched in 1943–1944. They were constructed as two flotillas, with names beginning with "W-" and "Z-", respectively, although, like the preceding U and V class, two of the flotilla leaders were named after historical naval figures. They were known as the 9th and 10th Emergency Flotilla, respectively and served as fleet and convoy escorts in World War II. None were lost during World War II but INS Eilat was sunk during the Israel-Egypt conflict in October 1967 by Egyptian missile boats and the El Qaher of the Egyptian Navy was sunk at Berenice, Egypt on 16 May 1970 by Israeli Air Force aircraft during the War of Attrition.

The U and V class was a class of sixteen destroyers of the Royal Navy launched in 1942–1943. They were constructed in two flotillas, each with names beginning with "U-" or "V-". The hull was nearly identical to the preceding ships of the S and T classes, but the U and V class ships had different bridge and armament fits. The flotillas constituted the 7th Emergency Flotilla and 8th Emergency Flotilla, built under the War Emergency Programme. These ships used the Fuze Keeping Clock HA Fire Control Computer.