Here is a link to the CAA radiotelephony manual CAP 413.
CAP 413
It is a "Free" Adobe Acrobat download. In recent years it seems to have increased in size and appears to be updated reasonably regularly. It is now at the 13th edition and should cover matters concerning phraseology in aviation radiotelephony (e.g. TYRO is mentioned under Note 2 of Para 5.1 of Chapter 11, page 3).
As with all aviation there are some contentious bits and pieces which have been debated on occasions, but it is the rulebook as far as r/t is concerned I guess.
I tend to read the official word and then modify my understanding and application based on the experience of other pilots both more and less experienced and add a bit of common sense dependant of the r/t situation.