And, to add to the debate, there's this quote from LASORS, section H2.1, which describes the requirements for an Instructor to be able to instruct for an Instrument rating:
Have completed at least 800 hours of flight time under IFR of which at least 400 shall be in aeroplanes. Where pilots have recorded flight by sole reference to instruments and not under IFR, then 1 hour sole reference to instruments may be counted as 4 hours flight by IFR.
FFF
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