Car seats in Europe

[Pana]

We're thinking of heading over to Greece for a holiday later in the year and along with all the other crap we need to take for Master A is his car seat on the plane (too big for the airplane cots and he is too small for the plane seats)

I've tried to find out what standards they use in Europe for child seats (apart from ISO) and whether they include the top anchor point for the strap that we have in Australia - the most I can find is in Greece they use both ISOFIX and the system we have here where the seat belt is used to secure the car seat in the car.... but there seems to be no secondary anchor point...

Does anyone know anything more?

EDIT: can a mod change the subject to Kids Car seats in Europe... sorry