High Definition versus Standard Definition that's the problem. If you watch BBC or ITV National news in HD and then watch your local news chances are your local stations are not technically capable of broadcasting in HD so your local news comes from the nearest studio that can transmit in HD . In my case that's HD from Birmingham rather than SD Nottingham. Again in my case I just select chanel 101 for SD from 108 for HD from Virgin.
This same situation occurs throughout the country.