medicals and revalidation
Mmmmmm !
I wish I had had a recording of the conversations with my CFI at the time. We fell out anyway later over other shall we say "management" issues from his somewhat autocratic and also inconsistent style. It seems it extends to application of the rules too and perhaps he needs a "revlaidation exercise" in that area.
I have spoken to a number of other CFI's since and got varying requirements for signing, as well as scope for the revalidation test.
The FAA system really is simplest and generates a minimum of two hours for the instructor (and pilot) too.