itv-hd isnt a channel, its an interactive stream. A scan may show it as data channel '10510' depending on which receiver. There are fixes for most HD receivers to edit the pid's to show as a tv channel.
Have you tried the editing advice found on this forum?
Here- http://www.digitalworldz.co.uk/index.php?threads/180311/
If you are not able to manually add then maybe the only way is to use someone else's working channel list? I dont have one but maybe someone else can help?
It would be helpful if you could upload it here please 2tone. Someone asked me in pm recently too but i cant remember who? I think a few people may want a copy to solve, so its worth uploading.