I see the new season of Greys Anatomy has begun and said available to watch from 5 January, however there are no episodes that are available to watch.
It's now moved from Sky to Disney+ , the new Season premiered on Disney+ in October.
To follow up from @Martin_14 any new seasons of Greys, Station 19, 9-1-1 and 9-1-1 Lone Star will not be on Sky. Disney kept all the rights for their own streaming service.
Any seasons that are still on Sky Witness will expire and not return.