I'd say this is a relatively simplistic book for beginners. Lots of the recipes are the easy to make sort that I make all the time and always have e.g.: hummus, roast veges, baked salmon on herbs, homemade muesli, porridge, pancakes, anything with spelt in it, the power balls. Jamie Oliver and many others already do all of this in a more interesting way and they often offer alternatives to McCall's only alternative to wheat, spelt. Spelt, btw, is not good for diabetics, it has a 7% sugar rating. I use it, but some can't.
I didn't feel this book enlightened me at all. I did feel that some of the recipes had some sugar alternatives that made them very expensive indeed. Maple syrup is a crazy price in my country. I didn't look at every recipe in detail, but I don't believe McCall mentions agave syrup, stevia, etc, at all. She doesn't have tips such as apple puree being an alternative to eggs, nor does she mention that fruit leather is higher in sugar than sugar and is super bad for your kids teeth. It's all a bit disappointingly naive really.
I give it a 2 because it's a healthy food book, but it isn't a book on how to kick sugar at all if it has 250mls of honey AND dates in the flapjacks. Blimey, that's ALOT of sugar. I think McCall is just jumping on the anti-sugar wagon. Look around, there's sure to be better books than this.