I visited the Knitting and Stitching show today at Alexandra Palace and although I didn't see 1 ply specifically I bet it was there. There were yarns of all plys, textures and colours. And the place was absolutely packed with people of all ages including teenage school children.
I know how to save the NHS money
Clever scam I fell for, but no harm done.
Who lives in a house like this? On a couple of my bookshelves