Collapse piece with fine over-twisted wool and sewing thread

I found my fine and not so fine over-twisted yarns for collapse from this shop in London. It was easy to order. I contacted them and they have several types and S & Z twist yarns as well.  Contact: the handweavers studio & gallery:  info@handweavers.co.uk or try sales@handweavers.co.uk. they have a web site, too.