The basic technique of imparting flight instruction is the same in any environment. Brief-monitor-debrief.
The UK CAA favours re-introducing the FI revalidation proficiency check. Does this still include such pointless items (for instructional ability) as a pilot-interpreted let-down (also revalidated on IMC/IR checks)and a non-instructed PFL? Those do NOT need to be checked on such a test; they might have been back in the days when there were no mandatory checks of piloting skills post-GFT, but not nowadays.
I can't see that a 6-yearly re-test will have much merit; it might well be desirable in some people's opinions, but they must prove that it is essential before such a change is approved. Which I challenge them to do with factual proof of lowering standards or deteriorating safety records...............
............and the CAA is not testing 'Q'FIs - only the military does that! Civil terms are FI and FI(R)!