Hi Docherty,
Thanks for chatting with me in our PM, a replacement SIM is now on the way.
Just as a bit of future advice for next time you go on holiday, if it happens again - Try popping your SIM into another phone to see if it works.
If it doesn't have the same issue then it may be an issue with your actual handset.
If you do jet off somewhere nice soon, please let us know how it goes 🙂
Thanks,
Megan_L