I am not totally clear on the reasons but in Spain for example the JAA IR Initital flight test can be done by any examiner and in the UK only by a CAA examiner. I understand there are issues around the standards of the initial tests in certain countries that our CAA do not like. You have to submit the test paperwork to the CAA that issued your licence for issue.
I will find chapter and verse on the theory element but there is something about the theory that causes a snag.