Various parts went missing when the wheel (literally) "fell off" last Fall. It turns out I need 4 lug nuts as well as various and sundry other parts. I went to Autozone today and showed them the lug nut I needed and they were unable to help since they could only match it to the make and model of the donor car. Apparently Auto Zone does not stay up to the on Catherham's idiosyncrasies....
So, who knows what works on a Caterham S3? I dont think the "uprated rear brake system" has bespoke lug nuts as the rears are interchangeable with the fronts. I assume these are fairly common?