This is a truly marvelous book. I have it on loan from the library. It's really bad but I am using the library as 'try before you buy'. I love all Search Press books and usually they are quite slim but this one is really pretty thick. There is so much in here I just open it and get all tingly.
I am most interested in jewellery and templates for my own ideas. With this book I have been able to teach myself how to draw really quite complex knotwork patterns.
May I just add as a separate opinion, not related to this excellent book - I know Celtic knots have a lot of mystique etc, but really they do just boil down to weaving. In weaving you have to get your 'overs and unders' right or the thing ends up with holes. Its exactly the same for knotwork. Hope this doesn't offend, but really, we need to think out of the box and see the bigger picture...