wrote: Sounds as if it’s a Sky problem. I wonder if updating to iOS 12 has caused it.
I don't think it is related to that as this is happening on various different platforms and not just IOS as per this:
We are aware customers may currently receive one of multiple errors when attempting to view Sky Go on iOS, Android or Web. This has been reported to support teams who are currently investigating. Apologies for any inconvenience caused by this.