Keeping King George V-class battleships into the 1980s

How could King George V-class battleships be refitted to last into the 1980s?

Keep only a few, add helicopter and missile capability, and justify their cost only against a major opposing battleship threat.

A speculative refit would retain only a few ships, with Vanguard and Howe among the more plausible candidates. One turret could give way to a helicopter facility, while missiles such as Sea Dart would update the air-defense fit. Machinery renewal and the cost of retaining old battleships would still drive the decision. A comparable Soviet battleship threat would be needed to justify the force, and a serious Soviet programme might instead prompt new British battleships and Malta-class carriers.