am I correct that every ATP under JAA or CAA jurisdiction up till recently underwent a routine EEG?
Well, not quite ALL. As I explained in #5 above :
EEG's certainly were a routine part of SOME (not all) initial class 1 medicals in the 1990's. There were not enough facilities to do it on all candidates, so it was done more or less randomly. Obviously on any candidate where there was a neurological indication, but thereafter almost randomly on something like every tenth candidate to arrive at the Belgrano. But, just like the ill-fated Chest X-Ray a decade previously, the pick-up of abnormalities was abysmally small, thereby not really justifying the great expense of continuing to do the test at all. The EEG as part of the initial JAR class 1 was therefore eventually ditched - I'm not 100% sure of when, but 2005 seems about right !
As far as I know most of the interpretation would have been done by the CAA's own in-house neurologists, of whom there are usually three.