Ah, I knew I could trust Rebecca for a simple but not maddening pattern with clear instructions.

Okay, three skeins took me to 35 rounds which came to 21.5 cms from the very centre which is just over 8 inches. Excellent.

Ooh, a 14 stitch brim felt way too long so reduced it to 10 stitches. Hopefully that lessens my chances of running out of yarn before the brim is complete.

Ha, made it with a sizeable bit to spare. What a relief.