One-off warships that should have had sister ships

Which historical one-off warship should have become a larger class?

The panel nominates Dreadnought, Hood, Vanguard, nuclear Enterprise, Long Beach, and Type 82 Bristol, with most suggestions calling for four or more ships.

The proposed classes include four Dreadnoughts, four Hoods, four Vanguards, and four nuclear Enterprises. The Vanguard proposal specifically begins construction when Japan leaves the arms-limitation agreements. Long Beach receives a suggestion of ten ships, while Bristol prompts calls for four to eight Type 82s, preferably eight. The discussion then considers additional missile-cruiser conversions to fill an American air-defence gap before more Long Beaches could arrive. Zumwalt is set aside because three ships were built, and the separate suggestion of fifty Enterprise space shuttles is a joke outside the warship question.