BCPL
I too believe it was 1989. But once again, to emphasise, it was never a requirement to hold, as a minimum, a BCPL to be an Instructor. From the time that the BCPL was introduced the BCPL exams had to be passed before commencing an FIC. Then as now the Instructor Rating was always based on the PPL. Nothing ever changed in that regard. The Instructors that held the AFI/FI rating at the time of the BCPL introduction were issued with a 'grandfather right' to be able to continue to be paid. The grandfather rating given to pre-existing PPL Instructors who did not hold a commercial licence is a BCPL(R)