The French have a similar thing, the "voitures sans permis" - licenseless cars. They're driven at a max speed of 30mph, generally by old biddies. They cost a fortune, and the insurance is horrific.
Weird to think that people who passed their bike test before 01 can drive 3 wheelers (such as the Reliant Regal/Regal/Robin) thanks to the B1 entitlement you used to get with an A license.
One of the best looking 3 wheelers in my opinion is the Campagna T-Rex. I bet it would be a right hooligan round a track too!