Any mini pre 2000, however you can buy a heritage shell and build a brand new car with all new parts and get it on a 2018 reg
I don't think you could register it as a new 2018 car as the safety tests it would need to pass would be almost impossible to meet with a heritage shell. These are designed to replace 'worn' out shells so would then identify as the car they were replacing. Only legal way to 're-shell' a Mini.
Edited by Jase, 24 February 2018 - 11:15 AM.