The players themselves are hosted on the You View platform, but you can access them through a number of avenues.They are listed as apps within the Android TV Home menu of your Sony TV, as well as being accessible from the You View side.
I've been meaning to post on here that I found my solution.
You View says that its platforms contains about 17,000 programmes in all, and that's spread across live Freeview HD channels and catch-up programming.
Sony is the first television manufacturer to directly integrate You View onto its televisions.
And then one day I turned the TV on and it was (and still is) displaying "No program information" instead of displaying the name of the currently displayed program.
All other information about the current channel is displayed OK.