The same day I decided to give it a go and found the pattern to be incredibly simple. It was my kind of knitting pattern. It was supposed to be done in moss stitch, i.e. knit one purl one, but I forgot how to purl and didn't want to go upstairs and get my book to remind myself, so I just knitted it. It seemed to work quite well though. The only trouble was I didn't have enough wool to make a second one so had to unravel the first and start again on a pair for Little Bird using some chunky pale purple wool I had. I altered the pattern slightly by casting on less stitches, as she has smaller hands. This pair worked out pretty well though, fitted okay and luckily I did have enough wool this time. Here's a picture of the finished wrist warmers modelled by Little Bird.
To be honest, they could do with being a little longer, but I can bear that in mind for the next time I make some, but they are roomy enough so that she can wear a pair of fingered gloves underneath on really cold days. They took a couple of hours to make whilst watching TV which wasn't a hardship, so they are a great little winter project. If you are a better knitter than I and could use cable stitch or moss stitch, you could probably get a much better result too.
I'm pretty pleased with them though and can't wait to find some lovely chunky grey wool to make some for myself. I might even be tempted to make a few for kid's Christmas stocking fillers if I get the time. I may put this book on my Christmas list too as I like the simplicity of the ideas in it.