The Royal Navy's answer to a modernised Iowa

Did the Royal Navy have an answer to the modernised Iowa-class battleships?

No direct equivalent is identified. A nuclear attack submarine with torpedoes is suggested if Britain had needed to destroy one.

A British counterpart to the upgraded Iowas was unnecessary in this assessment because the Royal Navy was not planning to fight those American battleships. If that requirement had arisen, a torpedo-armed nuclear attack submarine is the suggested response. The hypothetical therefore depends on an existing underwater capability. No equivalent British battleship programme is identified.