In April 2023, BAE Systems was awarded a contract extension worth £656m ($820.65m) by the MoD to further progress the development of the aircraft.
https://www.airforce-technology.com/projects/tempest-future-combat-air-system-fcas-aircraft-uk/?cf-view
2023年4月にBAEはテンペスト（実質GCAP）のために、1,235億円の予算を獲得したみたいだ
やはり日英は対等と考えるのが順当