On BT Sport 3 it says Sky and BT subscribers can see the whole picture by pressing red button or similar. https://community.bt.com/t5/YouView-Boxes/BT-Sport-Europe-without-the-text-framing-the-screen/td-p/1570474 - Alternative channels for BT Sport Europe (#409), that allow you to watch the programme free of the additional text down the left side, and bottom of the screen. For those who were in the dark like me! go to channels 455 for standard broadcast, and 474 for HD. 'Sky customers press red for full screen, and BT TV customers switch to 455 SD and 470 HD'.