Why HMS Renown was not retained after 1945

Could HMS Renown have been retained alongside Vanguard after the war?

A postwar refit was considered, but three decades of hard service made the cost and material condition difficult to justify against newer battleships.

Renown had served through two world wars and the intervening decades, leaving a substantial burden of age and hard use despite her prewar modernization. A postwar retention scheme did exist: the discussion identifies a proposed 1945-46 refit and newer 4.5-inch radar-directed mounts that had been set aside for her. Those plans did not settle whether another expensive refit was worthwhile. The cost also had to be weighed against keeping newer ships such as Anson and Howe. The panel's assessment is that Renown's accumulated wear made a much longer service life difficult to justify.