Missile conversion depends on a cruiser's remaining life

Would Britain convert heavy cruisers into guided-missile ships or prefer new construction?

Old County-class hulls would favor new construction, but a larger 9.2-inch cruiser built near the war's end might justify conversion because it retained decades of useful life.

Missile conversion requires volume, stability, and enough future service to repay a costly rebuild. An old County-class treaty cruiser would offer too little remaining life to justify removing weapons, rebuilding internal spaces, and fitting new radars and launchers. A larger 9.2-inch cruiser completed near the end of the war would present a different calculation because it could still have twenty or thirty years available. Age and service horizon, rather than the heavy-cruiser label alone, are the deciding factors.