but again 4 hours of IFR flight corresponds to 1 hour of flight by sole reference to instruments.
Who says? Surely time spent flying with "sole reference to the instruments" is just that. You don't guestimate do you???
For instructing for the IR, there is an hours requirement of 200 hours of IFR time, or 50 hours of time by sole reference to instruments.
So you could have an IRI with very little ACTUAL or SIMULATED instrument time? Just "IFR" time (which I'm sure is worthless anywhere else other than England)......Scary, especially at the amount of money charged for their services.......