Felix Schoeller produce their own version, called True Rag Silk. 100% cotton base with a smooth surface that reminds me somehow of Epson Exhibition Fiber (aka Traditional Photo Paper) but less bright. Originally the True Rag Silk was formulated to 305gsm but Felix Schoeller recently re-formulated their True range and the Silk is now 310gsm. I originally had some issues with surface flaking on the True Rag Silk 305gsm. I am hoping the new formulation has solved the problem, because I really liked the paper, ticked a lot of boxes, really great performer, but am struggling to get stock.
My local Ilford distributor has confirmed that the Gold Fibre Silk is discontinued and replaced with Gold Fibre Pearl 290gsm