Britain's planned role in the invasion of Japan

Were British forces and resources being moved from Europe for the planned invasion of Japan?

Yes; British troops were intended to participate, and the Allied transport system could move them east given several months.

British troops were intended to join the invasion of Japan, and forces were already moving from Europe toward the Pacific. The Allies had assembled an enormous transport capacity by this stage of the war. Moving further formations still required time and large convoys, with a couple of months offered as the scale of the task. The necessary means and political will existed, although the invasion itself was expected to be extremely costly.