It may seem a strange thing to say about what is by no means the most powerful car in the line-up, but this new 420 Cup is the most extreme road car Caterham has produced to date. For it is nothing less than its racing car modified just enough to earn it the right to wear a numberplate. Which sounds rather exciting, even more so when you learn the sequential SADEV gearbox of the racer is retained too, which means that when you’re flat out you don’t even need the clutch. Up or down the box.