If the Royal Navy needed a ship specifically to fight Deutschland, what would it build?
Short answerIt would not need a matching cruiser; it could call a fast battlecruiser such as Renown from the wider fleet.
NotesThe Royal Navy did not need to build a mirror-image cruiser merely to defeat Deutschland. Its existing force structure included fast capital ships able to overmatch the raider after cruisers located, shadowed, or damaged it. The concise answer is to call Renown. Ship-for-ship imitation can waste money when a navy already has another layer that solves the problem.