Did Revenge end Britain's battleship-design lead?

Did the Revenge class mark the end of Britain's leadership in battleship design?

Broadly yes. The unbuilt HMS Agincourt is the only plausible exception, so Britain's later design ambition never became a completed leading class.

A viewer argues that the Revenge class marked the point when Britain ceased to lead the world in battleship design, despite later projects that looked impressive on paper. The answer largely accepts the distinction between advanced proposals and ships that actually entered service. It identifies the projected HMS Agincourt, whether armed with six 18-inch or nine 15-inch guns, as the only plausible exception. Because that ship was never completed, its design could not demonstrate British leadership in an operational class. Paper performance and completed construction therefore need separate judgments.