This is a one off ‘special’ only sold through the John Lewis chain of stores (in the UK) during the post-Christmas 2010 sale.
It seems that there was a huge batch of the undyed organic DK left after it was previously discontinued, so Rowan dyed it in several colours (at least 8 different ones) exclusively for the John Lewis sale.

Gauge: 22sts x 30rows on 4mm to 10cm x 10cm