This isn’t, as far as I can tell, a re-working, just a reissue with a new title of a book which first appeared in 2013 as William Newton’s Complete Guide to Painting. To the credit of Search Press, I got that information from the copyright page.
I don’t normally review reissues, but this is so good, and has stood the test of time so well, that I will at least give it a mention. It’s a classic guide to classic watercolour and well worth a read. You can see what I said originally here.
Click the picture to view on Amazon