That is a curious one. I thought that anybody with an fATPL can teach the IMCR - such an FI will have done the CPL/IR after all.
Surely you would like to be trained by someone that has bee trained to train for IF. It may only be a 5 hour minimum course and test withan FIE but it can make a lot of differnce in some cases. How many cpl/ir 200 hr fatpl holders can and regularly do fly light aircraft in IMC or under IFR - not so many I think.
When I did mine I had 200 hours or so and now over 2500. What grieves me is that it is advanced training for safety purposes with respect to UK weather as well as the other advantages re touring and flight on top etc. It is criminal to remove it just because further south things are different. Our small island nation needs to stand up and continue regardless it's not their sky!