How would a British blockade of Japan work?

Would the Royal Navy blockade Japan in a way comparable to its blockade of Germany?

Yes, but as a layered distant blockade, with submarines closest to Japan, cruisers beyond them, and a battle group held farther back.

The Royal Navy would use a layered distant blockade rather than keep surface battle fleets close to Japan. T-class submarines would shift from denying Japanese access to the South China Sea into positions near the home islands, with S-class boats supporting them. Cruisers would patrol the next layer. A battle group farther back could answer a major Japanese sortie without remaining exposed in the close blockade zone. The arrangement uses submarines to threaten attractive targets while keeping the heaviest Allied ships at operational distance.