Thanks for all the input. I guess I'll be arranging some supervision (whatever that may be) for the SEP revalidation flight.
From LASORS it would seem that to obtain a CRI rating would involve completing the CRI course and taking a skills test, the only concession to FI rating holders being that the 25 hours of theoretical knowledge training is reduced to 10 hours. But even if obtaining a CRI rating were a simple paperwork exercise I'm sure the CAA fee would make it unattractive to the average FI(R).
Answering the original question in a rather glib manner, why don't you ask your supervising FI?
I fail to see how this goes any way towards answering the original question. What makes you assume I didn't ask my supervising FI?