Al Jazeera has confirmed on their web site that Al Jazeera English SD Channel is close over on Sky on June 30th.
But after hours of working on this story we can confirm that Virgin Media UK are broadcasting Al Jazeera English SD Channel on Virgin UK Channel 622 is really as HD Channel and we can reveal that Virgin Media UK are broadcasting this HD Channel on an SD Channel stream.
Sources: Al Jazeera web site, Digital Bit Rate and TiVo.