Britain learns the Yamato and A-150 plans

What would Britain build if it learned the true Yamato and A-150 plans in 1938?

Britain would accelerate Lion-class battleships and carriers already in production rather than wait for a wholly new answer, likely putting major yards onto round-the-clock work.

The fastest credible response is to complete ships whose designs, guns, and yards already exist. The Admiralty could use the Japanese plans to secure three-shift working for capital ships and carriers before war begins, bringing more hulls into service sooner.