Glider
Captain
. Anyway, I don't believe either Erin or Agincourt were that powerful. If memory serves, the RN was not fond of them either. The British 12 inch gun was not nearly as effective as the 14 inchers the Texas mounted either. The RN BCs at Falklands made many hits on the German armored cruisers and it took forever to sink them.
The two problems that the RN had with the Erin were :-
1) Her beam was wider than any other RN vessel and as a result she had to private docks as she wouldn't fit inside Naval docks. Often she used a floating dock for repairs which was expensive and at times inconvenient.
2) Despite her wider beam her interior was cramped by RN standards, sometimes compared to German standards. This in turn gave her more extensive torpedo protection but how effective this is we don't know as it was never tested.