2-plied it measures in at around 30 WPI. It looks silky (it's 80% merino, 20% silk) very thin and nice and consistent. I'm very very pleased!
After plying the first two bobbins of singles, making skeins and doing some maths I found that I had about 880 yards (from 130g). It's difficult to know for sure how much is needed for the pattern but I've plumped for 1200 yards and so I settled down to spin half as much again.
Which I've just finished. This is my 1200 yards of merino/silk, the finest I've made and the most I've spun in one go too.
These are small skeins (100 turns each = 166 yards) Next step is the dye bath and I want to make sure that the dye can get to all of the yarn.