There was an old requirement for instructors to have 5 hours on type before instructing, but that no longer applies.
and ..... one can tell!! It's funny how an aircraft owner often has to explain to the instructor what the various knobs do and what speeds one should fly at.
Re the need for the 50/150hr check to be done by a CAA approved shop, I
believe this applies for training for the
initial award of a license or a rating. The ownership (whether 100% or less than 100% owned by the student or his spouse) is relevant only if the instructor is being
paid for the flying. The traditional solution to this, in private Cat G-reg planes, has been to pay the instructor for ground school only
The foregoing is my recollection from several years ago when I was on G-reg.
What a grotty flying weekend it is, weather-wise. Just cancelled a 3-day holiday.