If the Royal Navy builds an 18-inch HMS Agincourt, does it also build a sister named Waterloo?
Short answerProbably not; Agincourt remains unique and the next ship becomes a new class of roughly 28-knot fast battleships.
NotesThe answer expects only one Agincourt in the proposed 18-inch-gun design. A sister called Waterloo would be welcome, but a follow-on class is considered more likely. The suggested successor makes roughly 28 knots and follows a fast-battleship direction attributed to Jellicoe and Prince Louis of Battenberg before Fisher's return. This remains a prediction about an unbuilt succession of designs.