Training duties could preserve First World War hulls into 1948

Which First World War-era ships would remain in Royal Navy and US Navy service if war began in 1948?

Likely the ships retained for gunnery training, with Hood and older carrier conversions possible candidates.

Hood is an obvious candidate among British First World War-era hulls, but the answer turns on fleet expansion rather than fame. A 1948 war could preserve whichever elderly battleships had been converted into gunnery-training ships because a rapidly growing navy would need their instructional capacity. Carrier conversions might also survive longer than the original capital ships from which they came. Those conversions, however, had changed so extensively that calling them surviving First World War ships obscures how little of their original fighting configuration remained.