After reading the above post., I can now also confirm that the same issue (Video not in sync with Audio) happens on the SYFY channel.
To be able to confirm that video is not in sync with Audio on the SYFY channel, I carried out the following steps:
A) I opened up the Virgin TV Go App
B) I selected the SYFI channel
C) I watched it for 5 second. I could then confirm that video is not in sync with Audio.
A similar method could be used to determine if such a problem occurs with the ID channel:
A) Open up the Virgin TV Go App
B) Select the ID channel
C) Watch it for 5 second. Access if video is not in sync with Audio.
Please pass on the above instructions to whoever requires it to help them solve this issue.