Well done David on the sale of your book, of which I have a copy.
Your book deals with post 1997 trads. What has been missing for owners of older cars is any form of a Haynes type manual. This goes back to when I had a 1938 4/4. I know that there is Gomog but it's not the same as a book with neoprene protective cover.
There is a Hynes type manual for the older 4/4s. I am in S Africa right now but it is in my office if you need the IBN number let me know.