I saw this when they first changed it (15th Feb), it seemed rather odd as one a +1 of a music channel isn't a normal thing and two the +1 is horribly placed, what I would suggest (even if it defeats the point) keep everything how it was (since Viva is now splitting the block of MTV music channels apart on Sky) but have the SD version of Live as the +1.
I can't see any reason for this other than to try and get more people to subscribe to the HD services, especially given that they haven't vacated the old EPG
slot for MTV Live SD, so won't be saving money in that respect.
The only argument I can think of to disagree is that MTV Live HD is 3rd from last on the list of music channels on Sky and I don't usually venture that far as I go into Kerrang and Chilled.TV, the music channels I don't want to watch.
"If I smile with my teeth."