Interesting, bose-x, could you clarify what you mean?
Flight in IMC in the Channel Islands CTR is obviously not possible with an IMC Rating because the airspace is Class A. I assume, therefore, you're referring to the Class D CTR's that surround Guernsey and Jersey. Many years ago (I've no idea about the present position), the IMCR used to be taught by instructors in Guernsey who only had an IMCR, and that included practice approaches in other than VMC! Does your letter of advice indicate that is no longer permitted.
I asked the question is an IMCR rating valid in the Jersey Zone. The answer was that it was only valid as far as reducing the viz minima on a SVR clearance and that it did not confer IFR privileges in the Jersey Zone. They also added a reminder that flight at night was IFR.
I have no idea what happened in the past but it is my understanding that Instructors teaching for the IMC in the Zone hold an Instrument rating when doing training in other than VMC.