Why the Revenge class survived while the G3s disappeared

Why did Britain keep the Revenge class when the G3s would have been more useful in a modern fleet?

Treaty limits barred a simple substitution, and Britain had already given up the G3 programme before the settlement was complete.

The apparent choice was constrained by the Washington settlement, which did not let Britain simply substitute the 47,540-ton G3s for its older battleships. Britain had also surrendered the G3 programme before the treaty terms were fully settled. Keeping the Revenge class therefore followed from the negotiated fleet and the timing of British concessions rather than a judgment that the older ships were more useful in a modern fleet. Treaty-era force structure cannot be read as a straightforward ranking of ship quality.