After a little bit of unpicking and re-stitching double rib top on smaller needles I was a lot happier with the result. I cast on the second sock last week on the same size needles. With a slightly tighter tension, the second sock came out OK.
Because this is a top-down design, it's difficult to estimate how much yarn is needed for each sock. This pair is calf-length. My ambition is to knit a really long pair that will go above the knee. For this, I need a toe-up pattern. Toe up patterns start at the toe, making it easier to continue knitting the sock up to the desired length and/or until half the yarn is used.
Just Yer Basic Sock by Alyson Johnson (Ravelry pattern. You have to be a member to view.)
Yarn: 4 ply - 50% Merino, 50% Silk (Posh Yarn, Sylvia, colourway Triumph) 388yds
Needles: 2,5mm circs and 2.5mm dps