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Do you know which YouView Box you have ? if it is 6 months old and a recordable BT TV Box it is probably either a DTR2100 or DTR4000 ?
So currently you are not able to see live Freeview HD channels on via the YouView Box ?
If you plug you aerial directly into your TV rather than chained through the YouView Box does the TV pick up the Hd channels (or is the TV only an HD ready TV rather than one with an Hd tuner)
If you playback an existing HD recording on the YouView Box does that display on the TV ?
How is your TV connected to the YouView Box is it HDMI cable , SCART cable or both ?