Key ExampleDescription Astra UHD DemoChannel is broadcast in Ultra HD or 8K. Channel 4 HDChannel is broadcast in 1080i (Sky+HD, Freesat, Sky Q) or 1080p (Sky Q) HD. Channel 4Channel is broadcast in 16:9 SD unless stated. Channel 4 +1Channel is a 1-hour time shift of the main channel and is broadcast in 16:9 SD. 16 more rows