Sorry guys, an interesting set of opinions but wrong - you need to understand the semantics.
JAR-FCL 1.185
An IR(A) is valid for one year. If an IR(A) for a multi-engine aeroplane is to be revalidated the holder shall complete the instrument requirements of JAR–FCL 1.245(b)(1), which may be conducted in a flight simulator or FNPT II. If an IR(A) for single-engine aeroplanes is to be revalidated the holder shall complete, as a proficiency check, the skill test set out in Appendices 1 and 2 to JAR–FCL 1.210, except for Section 6.
Thus, after one year your MEIR ceases to be valid. You may revalidate on a multi-engine aeroplane and hold a valid MEIR for a further year or revalidate on a single-engine aeroplane and hold a valid SEIR for a further year. This is also the opinion of the CAA as stated to us at our last TRTO re-approval inspection.