DFC, there are so many holes in that last post that it would take a yard of concrete to try and plug them. I suggest you go back to square and understand the rules yourself.
As for:
The UK can permit anyone it wants to teach for national licenses and ratings. The UK currently permits national pilots with no instructor ratings to teach for the grant of an NPPL.
Where on earth did you come up with that crap......
Sometimes you should read what you actually write and realise that the half the stuff you clearly make up does not come close to passing for rules.
A CRI may teach for any rating that they hold on their license or have embedded rights to such as Micro-light if they have met the relevant experience requirements. With an IRI they may even teach for the IR/IMC. This includes the various SET Class Ratings and Single Pilot Type ratings. Multi engines type ratings naturally require a CRI (ME).