As well as the published JARs there are also documents called AMCs (acceptable means of compliance) which are not published online, but form the basis for training organisation's courses.
One example of which is the AOPA PPL syllabus, which is used by a lot of training RFs.
The CAA will check log books to see if the syllabus has been covered adequately against the content of the PPL syllabus, as well as checking that the minimum requirements have been met.
Your flying club should be able to tell you what they work to