ITV Border is now listed as ITV Border England/Scotland.
English viewers can also view ITV Border Scotland on 802.
Are you sure you're not just picking up another transmitter? Our TV at work picks up Waltham and puts the extra channels in the 800s.
Same here, I'm not sure if it will happen anymore with the local TV channels but we used to get Channel 4 on both channel numbers 4 and 8 because of course in Wales, S4C is on 4 and Channel 4 is on 8. And since digital switchover when the transmitter power was increased, it's very easy to get signal from both regions.
The easiest way to avoid it is by manually tuning in each RF channel for the transmitter you want to receive, you can get them by putting in your postcode and checking 'detailed view' on the Digital UK site. http://www.digitaluk.com