Hi, Geraint.
Currently, 0613 is not currently available in that region keep an eye on this page for availability, as capacity gets increased across the Azure fleet. However, in the meantime, you have to wait, keep an eye on that page and Azure updates for availability notices.
Once its deployed to that region you should have the same experience as below:
Under your deployments, and edit deployment, you should see a list of models, to update your deployments with.
Then under Models, you will see the versions - these are automatically added by Microsoft, then you can change the Deployment to the latest version if required :
This is East US.