From the Knit Rowan website:
Crochet this granny square blanket, a free pattern download designed by Sarah Hatton and using the exciting Rowan Pure Wool Superwash Worsted (100% wool). A simple and colourful blanket that will add a lovely cosy feeling to any lounge or bedroom and is guaranteed to keep you warm on those cold winter nights. This crochet pattern is ideal for the beginner crocheter.

Yarn information:
Rowan Pure Wool Superwash Worsted
A - Soft Cream 102
7 skeins
1533 yards

B - Bottle 140
2 skeins
438 yards

C - Vintage 158
2 skeins
438 yards

D - Seville 134
2 skeins
438 yards

E - Mallard 144
2 skeins
438 yards

F - Rosy 115
2 skeins
438 yards

G - Gold 133
2 skeins
438 yards

H - Rich Red 124
2 skeins
438 yards

I - Mustard 131
2 skeins
438 yards

J - Electric 143
2 skeins
438 yards

K - Satin 116
2 skeins
438 yards

Gauge notes:
One square should measure approximately 12cm (4¾ inches) across each side.