Spike, found two sets so far, (three if you count an HS set). One pair is just carbs and linkages, manual choke late ones with tamperproof jet adjusters, carb number 3599B; one pair is auto choke complete with manifold, fuel pipes etc, early type with brass knurled jet adjusters. Carb tags are missing though so I don't know exactly what they're off but it'll be 1800 or 2300 SC.

Both have been sat around a while so will need a good clean up; the pair on the manifold are less filthy and gummy than the other ones. The thermostat housing cover is missing from the manifold but I've got a few around, you may have to find bolts though.

I'll keep looking as I think there's at least one more pair on a manifold somewhere.