Guess they have up to Halloween.
The bigger question is are they going to charge a premium for the privilege?
Three UK have been very vocal about their service and that there won't be a price increase for it. And 5G roaming will be standard.
O2 on the other hand have been strangely quiet about the service and any cost. Pretty much zero info has been released. Not looking good. Going forward, adding a premium might be a death knell for an already struggling o2.