The original suggestion imagined 12-inch proto-Lions, with one for New Zealand, two for Australia, and four for Canada. The ordering sequence creates a problem for that premise: Lion preceded the Dominion Indefatigables, although Indefatigable herself came earlier. The revised scenario therefore gives Australia and New Zealand a choice of the available Lion design with 13.5-inch guns. It also challenges the claim that choosing Indefatigables offered a compelling saving.
Notable Point · 4:38-6:04
Why the scenario starts with 13.5-inch Lions
The starting proposal changes because Lion had already been ordered when the Dominions selected their ships.