It was European and I was pretty sure it wasn't British - it didn't look Russian or E European. Which left France, maybe Italy or Sweden as the Spanish couldn't source anything like that from the UK or USA until the '60's
It was a twin jet (which was unusual pre 1955) and it was "Unconventional" - so Sweden or France. They built 2 (that was a major help!). Lots of scouring of old books and the internet but once I saw the picture it was easy to find a picture of the cockpit - and that awful handwheel on the port side of the cockpit = BINGO!
https://www.militaryfactory.com/airc...rcraft_id=1498 is a good source for the program
bit of a dog but tested a lot of future technology
OH I'm afraid!