Thanks for the comments.
Arfur !!!!-Sake - this could be my club!! My instructor told me he had been "reprimanded" by the engineer for making an entry in the Tech Log. In my opinion, this just creates a poor working relationship between instructors and the engineer.
I agree with toolowtoofast in that we need to differentiate between defects and observations particularly re: VFR and IRF flight requirements. Paradism's info is a great help in that, if I'm reading it correctly, the Tech Log contains defects which affect the airworthiness or safe operation of the aircraft - hence back to the point of distinguishing between defects and observations.
Thus for our flying club, it feels that a proper process in accordance with ANO rules should be established where the instructors, engineer and flying school owner can have a sensible dialogue regarding defects and agree upon then logging of such, where appropriate.