I've known about the Ariel Atom prior to the Top Gear test (saw it on the cover of a European car magazine and it was love at first sight!).
I've never driven one, but sat in one at NJMP. A group of guys from NYC have a "car share" program where you sign up to drive other people's cars from the club. One of the members was driving a spec Miata on the track and told us about the Atom in the garage, so we went to see it.
The guy that showed us wasn't "allowed" to drive the Atom on the track without his comp license. It's mind blowing fast on the track (he had a ride along in it).
I have run into a few people who've raced in the Atom series and they said the rear end is VERY tail happy. Of course, the cars are super fast as well.
You can try them here:
https://atlantamotorsportspark.com/drive-ariel-atom/