An Virgin Media viewer has pm me today with new information on Channels testing on Ex-C&W boxes.
VMTest1 - not broadcasting
VMTest2 - National Geographic HD
VMTest3 - not broadcasting
VMTest4 - not broadcasting
VMTest5 - not broadcasting
VMTest6 - not broadcasting
BBCHD = 17.6Mbps bitrate, 1920x1080i, 2.0/5.1 448kbps AC3 Audio.
National Geographic HD = 15.0Mbps bitrate, 1920x1080i, 5.1 384kbps AC3 audio. Probably 2.0 for some documentaries. Screenshot -
http://i32.tinypic.com/2vrvqs1.png