Sorry for the delay in replying, I was waiting for email confirmation from an ex college as you had me doubting myself.
I spent 4 years of my life issuing Flight crew Licences and ratings at CAA not so long ago, so one could argue my knowledge of the rules and regulations shouldn't be too bad either.
You write, Is there a difference when the MEP test is combined with a CPL test? No.
The answer is YES!
Section D JAR-FCL CPL(A) Modular Course - Multi Engine (ME) TrainingThe Skill Test may be completed in a multi-engine aeroplane, but to add a ME rating, a minimum of 6 hours dual flight instruction is necessary (see Section F3.2). This training is additional to the CPL(A) Modular course. If the minimum 6 hours ME training has been completed, the Skill Test in a ME aeroplane serves 2 purposes - for the CPL itself and for the MEP class rating.
I'll admit it's not that clear, but the bit I've put in bold clearly states the SKill test (referring to CPL Skill test valid for 1 year as we know) SERVES as the MEP class rating test....
OneIn60rule I'm sorry that happened to you, but that was a mistake.
So unless I was issuing it wrong for 4 years, and my ex college still there issuing them today.........
Linda/FFF if you want to PM me I'd be happy to give you the number to PLD.
VJW