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retuning film4 channel 15?

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I was watching channel 15 and a message came up about retuning I think it said to go  to  www(dot)digitaluk(dot)co(dot)uk/howtoretune    , I then went to basic retune instructions, and it says to push the DTV button on my remote control. I see no such button on my remote control. My TV is Samsung LE40C650 1UK  
Can anyone advise re retuning it?
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