A quick search of the forums revealed this little gem...
http://www.pprune.org/forums/showthread.php?t=85133
Although some of the info seems a little out of date.
The CAA list of approved FTO's is here:-
http://www.caa.co.uk/docs/33/Doc 31v81 - Approved Training Organisations.pdf
As far as I know the CAA is still the only JAA member state that approves FTO's in non-JAA member states to carry out JAR approved training, though I stand to be corrected.
Maybe the best way to approach it is to find a few FTO's that you like the look of, and then find out if they have JAA approval.