Are you on a Guido membership? EU roaming only works on Guido. Are calls/texts working ok? If so then check your internet settings and if the APN field has changed from 48months.liffeytelecom.com then edit it, change it back to that, save the change, reboot the phone and see if data starts working. If it doesn't then post back here or maybe contact 48 support. See the link in my signature below.
Hope this helps.
I am not a 48 employee so if you need to contact 48 support then use option 3 or the chat facility here.