Can we collectively talk about how nuts this is?
In today's modern day and age of optimization and cutting costs left and right, streamlining production, lean 6 sigma etc it's mind blowing that a manufacturer is has two nearly identical models running side by side with one being just a nudge bigger.
This doesn't really exist anywhere else other than maybe food items when you get to select your package size and even then its usually a pretty drastic difference.
Any normal manufacturer would have nixed S3 a long time ago and has moved on to a more "global" SV only version that fits a bigger percentile of people. Us second hand owners would hold the "old size" in high regard (who can fit or want them) and seek them out. Big kudos to Caterham to keeping the original (more or less) Lotus 7 going as it was.
Keeping the S3 alive also made it easier to fit into the Kei size format for Japanese market, which is a nice bonus.