I doubt whether you can. I live in the East Midlands and now get the correct regional news on BBC1HD. However, despite getting the correct version of Central News on ITV1 (SD), both ITV1HD and ITV1+1 show the West Midlands news (HD and SD with the same presenters at the same time with different news – ie. One of them is pre-recorded.)
On the rare occasions I can pick up signals from the Belmont transmitter (Yorkshire ITV) the regional news is South Yorks and Lincolnshire, the HD news is from Manchester. This seems to be the way ITV is!