Gauge for hat - 18 sts x 26 rows (10cm x 10cm) stocking stitch

Gauge for wrist warmers - 17 sts x 26 rows (10cm x 10cm) stocking stitch

Gauge for cowl - 20 sts x 12 rows (10cm x 10cm) central cable panel

Pattern correction per Let’s Knit site:

WESTFARTHING (FESTIVE KNITS) (PAGE 38)
The mitts have been mis-labelled. The instructions for the Right mitt are actually for the Left mitt and vice versa. When rejoining the yarn for the thumb, this is Row 37, not 41 as stated. The wrapped stitch is also at the beginning of the thumb stitches.

There is also an error on the Sewn cast off instructions. The tapestry needle needs to be passed through the first two sts from right to left. Then passed back through the first st on the LH needle from left to right.