"Radio Times lists two sections of The Cure's set at reading next Friday. It says BBC 3 will show an hour from 2100 bst (1600 eastern) and then more from 2330 bst combined with the Maccabees. But it suggests the whole of the show might be available on the red button!!" (Thanks Andy)
Full text from the Radio Times: "After the bonanza of Olympic coverage, the BBC returns its interactive service to what it now does second-best: providing extended coverage of music festivals. So while you can catch the first hour of an exhaustive set by Reading headliners the Cure on BBC3 from 9pm, press red at 10 to continue enjoying the pop goths’ triumphant return to a festival they haven’t played since 1979. If you’re a satellite or cable viewer, you’ll also be able to choose between bands on the main three stages.
BBC3 has lively Swedes the Hives and inexplicably popular US plodders Paramore at 8pm, plus more from the Cure at 11.30pm, and the Maccabees."
If anyone has any tips on recording from the Red Button, please let us know. :)
Update (Aug. 22nd, 2012): The BBC has put up a page with all of the various channel info here.