It's a unclear how much these little cars "caught on" here in the States -- but the idea of a racing series with smart cars sounds like a great idea. (They are kind of built like a big crash helmet anyway. So...why not?)
I ran across this ad in the March 3rd issue of AUTOSPORT magazine. It really makes you wish you were in the UK. They have lots of fun with little cars over there.
Check out the 4two cup action.