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ありがとう
その文の前に

The flying demonstrator will be a piloted supersonic aircraft testing a range of new technologies including integration of stealth compatible features. This is the first time the UK will have developed a new fast aircraft using 21st century technology.

テンペストのために初めて開発された技術をテストするための機体
そして

The demonstrator is vital for ensuring our technology, skills and industrial capability are ready for the future. Designing and building the flying demonstrator will prove integration and test skills. It will also provide invaluable data and lessons to UK industry to support the introduction of a new FCAS aircraft from 2035.

デモ機の設計と製造で戦闘機のインテグレーションとテスト技術を検証

というと一般的に言うと原型機という位置付け