The whole course must be done in the same country - I have very recently discussed this with the UK CAA PLD.
If you have completed the CPL(A) training and skills test in the UK then avoid any further complications by getting your licence issued by the UK now. Aso, your UK issued CPL(A) will come complete with FRTOL for VHF and HF Comms PLUS English Language Proficency (Level 4 - Operational).
Then you can go to any other JAA member state for your MEP (assuming you haven't done that already) and IR(A) training.
Yes, most FTOs will tell you that they will accept your 30 hours UK sim time - of course they will; they like your money - but the UK CAA will not accept them if you do them in the UK then go to another country to complete the IR(A).
Similarly, JARs allow a 10 hour credit for CPL(A) holders against the IR(A) and Greece applies the full 10 hours credit, i.e. the IR(A) for CPL(A) holders is only 45 hours in Greece. HOWEVER, if you only do 45 hours training then apply to the UK CAA to add an IR(A) to your CPL(A) they WILL refuse it as the UK CAA requires you to fulfil the UK's requirements which only allows 5 hours credit for CPL(A) holders. I have personally witnessed this happen and luckily contacted the UK CAA before the guy completed his training.
If you are going to mix and match your countries make sure you get your facts right by checking with the authority of the STATE OF LICENCE ISSUE.
BTW, anyone being told they need to do 55 hours IR(A) training when they already hold a CPL(A) is being fed BS. After CPL(A) (SEP) issue you do 6 hours plus Skills Test for MEP issue then 45 or 50 hours IR(A) training plus Skills Test, depending which JAA state you are submitting your IR(A) application to. Yes, these are MINIMUM hours!!!
HTH
2close