I presume that calls and texts are 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 changes, reboot and see if data starts working ok. If it doesn't then you'll have to contact 48 support. This (data not working while roaming in the EU on a Guido membership) seems to be a common enough problem for some users do some reason even though it should just work. Some users never manage to get roaming data to work at all unfortunately for some reason.
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.