Dockyard limits behind interwar British battleships

When would Britain have to upgrade its docks to sustain continued battleship construction?

Probably during the 1920s, after wartime disruption delayed a prewar upgrade cycle, leaving existing dock capacity to constrain new designs in the meantime.

British docks had been improved around 1910 and another roughly six-year upgrade cycle was expected before the First World War intervened. The delayed work would likely fall in the 1920s, with completion potentially slipping toward the end of that decade. Designers therefore had to build the best ships that existing docks and support systems could accept. Infrastructure directly constrained battleship dimensions.