[i.h]

There was a similar situation in the south west as Westcountry had a totally new transmitter distribution put into line at midnight so it wasn't just a change of origination point (I read somewhere that it was accidently put to air earlier that evening briefly)

There was quite a fascinating video on, of all places, the NTL Pension Association’s website, but it seems to have disappeared

Very high tech for the time, state of the art digital microwave links to link Cardiff to Plymouth, to the new sub regional studios and to the transmitters, and it didn’t carry just compressed digital video but also handling their data and phone needs too. Less capacity than we get into our homes today

PDC was patchy on ITV, there was a website at the time that kept tracks of what broadcaster was doing what and it's still online:
625.uk.com 

The most fascinating part of the ITV PDC debacle is how against it HTV were, yet Westcountry (whose playout was done by HTV) were the first to enable PDC