BBC Red Button HD on Freeview

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Joined: Mar 8 2009
I have just noticed that Freeview Channel 303 is the Red Button HD channel. I watched some of the T in the Park footage last night and it was horribly out of sync (the sound was about 3 seconds behind the vision).
I am watching some of the Women's football just now and because there is general noise and no onfield mics it is hard to tell how the sync is - until the Germans scored their third goal and it took about 3 seconds for the commentator to comment on it.
All the other HD channels are fine - has anyone noticed the sync problem on Red Button HD?