Do you have an iPhone @Neil22 ?
If yes, try changing your apn to mobile.o2.co.uk (instead of iData).
If no, then you need to get in touch with customer services to see if there is an international bar on your account.
Try messaging O2 on Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) , they should be able to help you with this.
You can also try manually selecting a different network to see if that helps.
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here
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