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Britain’s ability to develop engines to a sixth generation standard remains highly questionable,
with its Eurojet EJ200 which entered service in 2003 considered several decades behind -
and with the U.S. and Soviet Union both having developed
similarly capable engines decades prior during the Cold War.

https://militarywatchmagazine.com/article/britain-s-rolls-royce-developing-sixth-generation-engines-for-new-tempest-fighters
Britain’s Rolls Royce Developing Sixth Generation Engines for New Tempest Fighters
January-12th-2020