I finally got a chance to make this great cardigan. My friend had a baby girl last week and I decided to go for it. I used Lucia sock yarn from Posh Yarn that I had in my stash. It is gorgeous yarn in a lovely colourway, which of course you can't really appreciate from my crap photos!
Anyway, the knitting was great, I used size 3.5mm needles and it has produced a cardigan for a 0-3 month old. The instructions were a little puzzling, but that is EZ for you! Once I had pondered a while, it all became clear, and the end result is lovely.