Out of interest since it's relevant to me - I recently after a few years of having a no UK issued licence (although it was originally UK issued) have returned to the UK as my state of licence issue. The expired IR-SP-ME that was on my Irish licence has not been carried over to the back of my UK issued licence. I queried this with them and was told it didn't need to me because it was a requirement for the B737 300-900/IR on my licence.
Does this sound correct to you folk in the know? The prospect of renewing the ME IR (or even SE IR) is what makes me wonder as according to my licence I never had it and the CAA say this is correct.