The next thing to do was to buy a cord maker - £195.00 put paid to that idea. Beloved husband - source of all things practical, took one look at what I wanted and emerged some time later from the loft bearing what looked like the very first Meccano set ever invented. A bit of trial and error and the mark 4 version works perfectly.
A double length of stranded cotton is used on each hook and then spun so that each colour is twisted quite tightly - then with a small adjustment to the machine all four strands are twisted together giving a multi -coloured cord.
When we had achieved 36 cords we wound them onto cardboard tubes - and gloated!!
A good day's work!