The first triple-turret battleship built in a British yard

What was the first triple-turret battleship built in British yards?

Nelson and Rodney, although British firms had built triple turrets earlier for testing and foreign ships.

The question requires separating turret manufacture from construction of the whole battleship. British industry had built a triple test turret by about 1907 and later supplied triple mounts for foreign ships. Those exports did not make the foreign hulls British-built battleships. Nelson and Rodney were the first complete triple-turret battleships constructed in British yards.