[DTV]

The demand in Wales and Scotland likely isn't particularly high either.

In what way it's not particularly high? They are making an important public service for the Welsh and Scottish Gaelic language speakers

They are an important public service, but the average main evening edition of Newyddion gets around 20-30k viewers - which, while proportionally roughly in line with the audience for the BBC News at Ten, is less than a quarter of the viewing figures that the BBC News channel gets in that slot or the main 18:30 edition of Look North (Hull). It's still a small audience.

Assuming the same ratio of Network:NC viewers as the News at Six gets, a live simulcast of Newyddion could expect a mighty audience of about 600 News channel viewers.