The idea of a heavy cruiser emerged in the aftermath of the First World War, and was closely linked to the limits set by the inter-war Washington Treaty on naval armament. The pre-Great War concept of armoured cruisers had been abandoned, but in their stead the Admiralty saw a place for powerful cruisers, able to patrol the sea lanes of the British Empire, and which were well-enough armed that they could destroy enemy commerce cruisers of the kind...