Unfortunately ​@Pmyria, if you’re using automatic network selection on the phone with your iD SIM, it has connected to the strongest network signal available (i.e. an Albanian network). 

Maybe better to use manual network selection or set your account bill cap to £0, to avoid out-of-plan charges while in Corfu.

Thank you for the quick reply, much appreciated! Do you know how I can check with ID directly? I can’t seem to find a customer service person to talk to? Many thanks

This community article might help you contact iD support, ​@Pmyria.  

Hi there ​@Pmyria, we hope that ​@andewhite and our live-chat were able to help.

Please let us know if any further questions.

Thanks,

Tyler