Two loads of yarn later, here's the results. The yarn on the left is a naturally very pale grey which came out beautifully slate blue with the woad, and on the right the larger skein was a natural creamy white wool that has taken the colour very evenly and is a glorious glowing blue.

I couldn't resist knitting some up right away, the two Monmouth 'labourer's caps' here are in the natural pale grey and the slatey blue, and have been through a hot wash to full them, which is always a good way to check that your dye is stable on the fibre :)
