British Labour Government dosen't see Nene engine to USSR

I'm on a bit of an aviation kick so here's another POD.
In 1946 the British Labour Government sold the Rolls Royce Nean engine to the Soviet Union. This was the most advanced jet engine in the world at the time and the USSR promptly reverse engineered it and used that copy to power the Mig-15. Most Soviet aircraft engines were devoloped from the origional Nean copies. Prior to this sale the only Soviet jet engines were powered by copies of the German Junkers and BMW engines captured in WWII. These were underpowered and primitive which made 1st generation Soviet jets like the Mig-19 and Yak-15 less capable then British and American jets of the late '40s.
What are the effects of Labour never allowing the sale of Nean engines n 1946? What are the effects on Soviet aviation and the Cold War?
Edit: Title should be sell not see. sorry
 
Without the Mig-15 to worry about the Korean War would be much easier for UN forces.
Although, the B-29s over North Korea, may have losses due to lesser aircraft than the Mig-15, they would be less than OTL.
While, US aircraft technology would not advance so fast - the early F-86 would be more than capable. On the other hand, the prize for the USSR would be to capture western aircraft.
Hence, Soviet aircraft development would lag behind OTL by anything from 5 -10 years. And probably western development by 2 or 3.
 
Given some of the absolutely stupid things the Brits did in aviation policy post WWII through say '65 I sometimes wonder if the Sovs had an agent in place. Other than Philby and Burgess.
 
An idea already explored a couple of previous times, such as this thread

https://www.alternatehistory.com/discussion/showthread.php?t=100927&highlight=Nene

In my view, it would hamper Soviet fighter development by around 5-6 years at most, with accompanying impact on the development of the Mig-15, Korea, and a slight lag on subsequent development. Things will catch up by the latter half of the 1950s. Significant, but not decisive.

It would give the B-36 an extra year or so of viable deterrent service, given the flow on delays to the reheat Mig-17.

For the impact to be decisive, you'd need an accompanying development and utilization of the Nene and Tay by Britain, which would help to bridge the 'intermediate jet fighter' gap that proved something of a retardant on British engine and fighter development for a number of years. Of course, this would need other things to change, such as policy, position on supersonic flight, funding and strategy. However, keeping a small edge (and denying it to an opponent) does open the door to such a scenario.
 
Given some of the absolutely stupid things the Brits did in aviation policy post WWII through say '65 I sometimes wonder if the Sovs had an agent in place. Other than Philby and Burgess.

I seem to recall several news stories in the 1990s that posed that same question. It was pretty much a given that Labour and apparently some key elements of the military were compromised, and in fact one writer postulated that Britain was maintained deliberately as a "Western" power to give the Soviets access to NATO and US information. NOt sure I buy that, BTW, but it was seriously considered by others in retrospect.
 
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