I finished this last night, but things got a little out of hand and I have only just made the tassels for it.
The yarn used is Rio by James C Brett, the colour is Meadow. The spirals are created by short row shaping. The pattern requires that you only knit it 16"18" between spirals, I made it longer, as I knew I had enough yarn to do this, and I wanted the scarf to be able to wrapped around the neck once completely.
It was loads of fun to knit. The upper photo is a closer look at the spiral.