I can confirm I can watch ITV HD on my Sky+ HD box.
First of all, you need to have got the new
EPG on your box if you want it to work. That is, the one that looks like this...
Boxes with the old EPG don't have the right codec to view ITV HD, so if you've not got the new one, you'll have to wait until Sky eventually send it to your box I'm afraid.
If you've got the new EPG, go to 'Add Channels' under the 'Options' menu and enter the following information:
Frequency:
11.427
Polarisation:
H
Symbol Rate:
27.5
FEC:
2/3
Press Yellow to Find Channels. Your box will now scan the transponder for services.
From the list that appears, you should see a channel labelled '10510'. Highlight this and press Yellow to store, then Select to continue.
To view ITV HD, go to 'Other Channels' under the 'Options' menu, arrow down and select '10510'.
Unfortunately as the channel doesn't have an EPG number, it won't appear on your normal list of channels, and you won't get Sky+ functionality - so no recording, pausing, rewinding etc.
Hope this helps.