How about no Korean War?
The Korean War diverted UK industrial effort into re-armament, absorbed manpower into the military and generally dislocated the government's planning.
In particular, Gaitskell, the Chancellor of the Exchequer, said there would have to be sacrifices in current consumption. According to Correlli Barnett in "The Verdict of Peace", those sacrifices were in the production of consumer goods such as tv's, refrigerators, radios and various vehicles. He concludes these were just the products in which Germany and Japan became dominant.
The "Korean War Boom" greatly benefited Japan in particular because the USA spent freely there, both on equipment (cheaper than US products) and supporting its military "presence".
Therefore, no Korean War.....no disruption of the UK, and no boost to Germany and Japan.
As a side effect, there may then still have been a stigma against Japanese and German goods in world markets because they would not be seen as important allies in the Cold War, and not rehabilitated in buyers minds.
Just a thought....but I don't know how to prevent the Korean War, presumably stronger deterrence by the USA in the late 40s....if the domestic politics would allow it.