Where Britain expected to base a counteroffensive against Japan

Would Britain have sought Portuguese basing rights at Macau for a war against Japan?

Probably not as the main solution; Macau and Hong Kong were vulnerable, while a base nearer South Korea could support a cruiser-and-submarine blockade backed by carriers and capital ships.

Macau probably would have fallen with Hong Kong, while Hong Kong itself was treated more as a passing base than the center of a counteroffensive. A sustained campaign needed a defensible forward facility, possibly in South Korea, with Weihaiwei more useful than Port Arthur as the supporting base. Cruisers and submarines would enforce the blockade of Japan while capital ships and carriers remained farther back until required. The aviation train could have included as many as four Unicorn-type support ships. A possible force of up to six Implacable-sized carriers could have operated alongside the armored fleet carriers, tying basing, blockade, and aviation support into one operational system.