If you've got the new guide (with the mini tv) then you can add the channel manually and then store it. I'm watching it now...
Press the services button Go to add channels Change frequency to 1.1427 Change polarisation to H Press "Find channels" Store the channel shown as 10510 Go to services-> other channels and watch 10510. Hey presto, footy in HD!
Don't think so - it's just a test feed for all the ITVHD programmes. If there isn't one on after the footy then you'll get a "service not available" test card.
I take it you have had your new guide for a while now? I haven't had mine updated yet :'( Did you have to do anything for it to come 'live'? Or did it just come on by itself?