Thanks for confirming which box it is affecting. I just want to check further if that's ok, is it that some recordings from Coronation Street are recording from 103 ITV instead of 113 ITV HD? Or is it more to do with the picture quality?
It may be as Ernie_C suggested that it's down to not all programmes are broadcast in HD even though it's on a HD channel.
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Sometimes the shows can be played in SD on a HD channel as previously mentioned but this isn't something that should happen if the show is listed as HD. Since we spoke last there have been a few episode here in between, are these showing SD also, or was this a one off?