Like others have mentioned: I remember seeing the Ariel Atom [featured on Top Gear](https://www.youtube.com/watch?v=WaWoo82zNUA) and reading about it here and there. It's great you were able to drive one. Sounds super exciting.

I wouldn't have guess that you could leave it in 4th gear for the entire track but come to think of it when you have such a good power to weight ratio gear changes would become less necessary when the track is set up to fit the one-gear technique.