As far as I know (but I'm here to verify!) the rest of Europe works identical to the Ireland situation as listed above
The French do, also the Spaniards. If you do not close your flightplan, you get an expensive SAR operation started. Flying to an uncontrolled airfield, you can close over the radio as described (at least in France), or you call a phone number (0-800-IFRVFR in France, IIRC).
What does ZTZX mean, btw?