Why a Royal Navy Saint class was politically awkward

Why was a Saint-class naming scheme unlikely for British capital ships in the 1920s?

The song association was anachronistic, and religious, Irish, and naval-tradition complications made a patron-saint group politically implausible.

The later popularity of 'When the Saints Go Marching In' cannot explain a 1920s class because the song was not yet established in Britain in the relevant way. A scheme based on the patron saints of England, Scotland, Wales, and Ireland would also collide with Irish independence and the politics of Northern Ireland. Protestant constituencies could object to a conspicuously saint-centered formula, especially where it appeared to impose a Catholic frame. Royal Navy precedent offered little support because even St George had been used only rarely and not as a normal battleship naming pattern.