Yup, Lewis is just the line of hose made by House of Cheviot. And that's where the problem lies: House of Cheviot. They change the availability of colours each year, apparently, and in their latest change they have dropped several colours from the Lewis line (even though these colours seem to still be available in other lines of hose). Why they did that, I do not know. But I think it was a poor decision.

For example, look at their 2011 catalog. There are some colours that I really like in the "Orkney - Trellis stitch" and "Shetland - Cable stitch" lines (page 7). The colours I have my eye on are Bison, Tundra, and Heathland. But if you go to page 9 of the brochure, where the Lewis hose are shown, those colours are not available there.

I really don't understand why they would do this. Why not just make every line of hose available in every available colour of yarn? Do they not understand that people like to have options?