I've been looking into car seats suitable for international travel.
I emailed a few manufacturers directly to see if they could help so far the most informative response I've gotten is:
"I'm sorry to say that the standards between the EU an Australia are different enough that non of our Australia seats would comply to EU regulations"
I've seen people in various forums claiming that the anchor/harness is the root of some incompatibility, but that doesn't match what appears to be the official line, for example from "vicroads":
Does the booster seat have to be anchored?
If the booster seat comes with a tether strap it must be anchored to the child restraint anchorage point. There are also some booster seats that meet the Australian Standard (AS/NZS 1754) that do not come with a tether strap and therefore do not need to be anchored in the vehicle.
So my question is what's the difference between the regulations that makes this so hard? Is there a method to find a car seat that has the all important correct stickers for multiple regions?