Thank you for your reply.
I appreciate you have not ordered a new sim. We are currently migrating our customers on to our new sim and this will be why you have received this message and the reason I have checked how long you will be outside of the UK.
Unfortunately, we are unable to avoid the change taking place and you will need to activate the SIM within the handset in order to continue using the service.
The sim will be sent to the account address, is there anyone available to forward this on to you?
Thanks
Nat