Lion-class turrets, resources, and Yamato intelligence

Were Lion-class turret-development problems severe enough to delay the ships?

The harder problem was wartime resources; accurate knowledge of Yamato's eighteen-inch guns could have justified completing several Lions despite that cost.

The Lion turrets evolved from Nelson and Rodney practice, so the central obstacle was not an impossible mechanism but the cost of new sixteen-inch guns and complex mountings when spare fifteen-inch equipment could arm Vanguard. Had Britain known Yamato carried eighteen-inch rather than supposed seventeen-inch guns, at least Lion and Temeraire, and perhaps four ships, might have received stronger priority.