I produce youtube videos and am a musician, and i can tell you for a fact that this problem is down to Sky, and not down to anything my end (in before a nowtv staff member tells me to use a different headphone port). I can stream in full HD audio and video from other providers, so it isn't related to my bandwidth, unless Sky has some odd throttling mechanic if it deems you "unworthy". I should add that, rather peculiarly, the video quality is somewhat better than the audio. Vocals are reminiscant of having being recorded in a bathroom.
This isn't acceptable.
