I have noticed a worrying amount of people who having done their JAR ATPL theory in the UK, have spotted some good looking ads in the mags for CPL training within Europe and decided that yes that's for them. This is without being aware of the "State of Licence Issue" issue, which would generally exclude you from obtaining a commercial licence in another JAA state having done the UK theory. That is unless you can meet the 185 residency rule in the foreign state where you wish to train.
There is a paragraph though in LASORS that leaves the door slightly ajar.
JAR-FCL CPL Modular Course of Flying Training completed in another JAA Member State (other than the UK)
An applicant who has a valid pass in JAR-FCL Theoretical Knowledge Examinations completed through a UK Approved Training provider, wishing to
complete a CPL modular course of flying training in another JAA Member State should in the first instance contact the Authority of that Member State. The
applicant should confirm with that other State that they are willing to recognise their JAR-FCL Theoretical Knowledge Examinations and that they will be the ‘State of Licence Issue’.
The question is then which JAA States offer a blanket acceptance of the UK ATPL theory exams? Particularly so Spain and Greece, which seem quite well talked about here.