As a proofreader I found this extremely useful with lots of tips and tricks even I didn't know about!
William Critchley provides a light-hearted and often humorous look into the world of proofreading and copy-editing.
There are plenty of examples and step-by-step instructions and some useful exercises towards the end for you to practice.
I have given the book four stars - as opposed to full marks - for two reasons:
A. I found some of his symbols very outdated compared to today's marks and at times this was a bit confusing.
B. The constant reference to a bear called Archie and Eva Longoria was both tedious and unnecessary. I am not sure why he kept mentioning them and am still unsure of who Archie is. Although some explanation is given at the end. Even so it got very tiresome!
Overall though, I would recommend this to beginners and experienced proofreaders looking to maybe refresh or rekindle old-style memories.