YOU might notice that BBC Three isn't where you expect it from today.
The channel is on the move as part of the BBC's huge HD upgrade plan.
Sky satellite TV customers will now find the popular entertainment channel at number 115.
But only if you're located in England and Northern Ireland.
The broadcaster has been gradually converting all its BBC One channels to HD, so the top 101 spot shows your local news.
BBC One South East is the last to switch today.
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For viewers in England, 115 was the number to catch BBC One in HD.
But now the switch is complete, 115 is vacant, meaning BBC Three can take its slot.
BBC Three was previously on channel 117 across England - and way back at 173 in London.
The channel is already on 115 in Northern Ireland.
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In Scotland, BBC Three remains on channel 141 for the moment.
And in Wales, it's staying put at 117.
The project only affects satellite - so if you've got Sky Glass or Sky Stream you won't notice any difference.
But be sure to check any series links you have set-up, as some people have already reported that the upgrade has messed up with their recordings.
Viewers with an old non-HD satellite box will have to get a new HD one to continue getting BBC One, whether they're on Sky or Freesat.
Fortunately, Sky is offering a free upgrade to Sky Q for affected customers.
Freesat viewers will have to buy a new box entirely - though the BBC is offering support to those who need it most.
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