Underwing refuelling seems to be an Americanism for any kind of pressure refuelling…. I think it’s fair to say the Comet was the first with pressure re-fuel points actually under the wings, and as well as Bruce’s FW190, we could be looking at beating a 1938 Modified HP Harrow for the first aircraft pressure refuelling system…….

After all that research, I need a lie down. (I’ll stop taking over now 😉