OK I did a quick check on the Chefs books I named checked and they text is all copyrighted to them (including Ramsay). I also have a couple of the early Jamie Oliver books…and you guessed it the text is under his copyright…!
These are books I tend to like and use -so maybe I have a good nose for a trial chefs book.
I also checked a couple of the “christmas present” books I have received - which are all published by one of the big global players - and their copyright is with the publisher not the named chef on the cover…and indeed their recipes reflect that and the books have never been really used.