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From Wikipedia

By 1946, Soviet designers were finding it impossible to perfect the German-designed HeS-011 axial-flow jet engine, and new airframe designs from Mikoyan were threatening to outstrip development of the jet engines needed to power them. Soviet aviation minister Mikhail Khrunichev and aircraft designer Alexander Sergeyevich Yakovlev suggested to Joseph Stalin that the USSR buy advanced jet engines from the British. Stalin is said to have replied: "What fool will sell us his secrets?"[1] However, he gave his assent to the proposal and Artem Mikoyan, engine designer Vladimir Klimov, and others traveled to the United Kingdom to request the engines. To Stalin's amazement, the British Labour government and its pro-Soviet Minister of Trade, Sir Stafford Cripps, were perfectly willing to provide technical information and a license to manufacture the Rolls-Royce Nene centrifugal-flow jet engine, a move which even Russian sources have mocked. This engine was reverse-engineered and produced as the Soviet Klimov RD-45 jet engine, subsequently incorporated into the MiG-15.[1] (Rolls-Royce later attempted to claim £207 million in license fees, but without success.)[citation needed]

So what if the British government has said no? Even under Atlee, it's possible, let's say that word of a Soviet war atrocity got out just before the request was made and it would be politically impossible to accede.

Obviously it wouldn't stop the Soviets getting jets in the long run, but what about the short-term consequences?
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