Why, for example, did B-36/(B-29D) B-50 and Avro Lincoln continue in production after VJ Day?
Probably for the same reason that the Soviets initiated the production of the TU4. They certainly did not need it on the German front.
You have to remember the attitude of the Atlee government to the Soviet Union. The Labour members of Parliament were singing 'The Red Flag' in the House of Commons.