Perhaps I was mistaken about British Amazon no longer stocking Epson Kozo. Earlier I had visited the site and could not find the paper using the search function. But when I unearthed my original digital invoice from Amazon and hit the re-order button, the site hopped right to it and issued a probable delivery date. So we'll see.
Meanwhile, I identified the Japanese vender I had once used. It's called Fishpond. Unfortunately, its prices are higher and delivery slower than Amazon. Still, it's a good ace in the hole.
Any other resources would be appreciated.
Thanks