no requirement to log 'IFR flight plan time', but in reality, if fiddling with the regs, European IRI aka Yurop's CFII rating/certificate does require 'instrumetn flight RULES time' I leave the exact section to those who fancy digging the regs right this moment. I find it ridiculous, in terms of ambiguity, and people mentioned here that UK CAA accepted experience at certain ratio reduction.
Do I have IR? Well, fixed wing one so far anyway. Did I log simulated or actual instrument time? Yes. Did I log VMC flight on IFR flight plan for ATC practice etc, as for the European IRI requirements? Nah.
Did I see 'inside of the white bits'? Yes. Would I do so in R22/44? Nah.
Does my past training help me make it through IIMC in light heli? YES.