According to my HST diagrams, that I've got from the 125 group, they
should both be HSTs, although with the engineering work taking place and XC being XC you can never be 100% sure. According to the diagrams, the other southbound XC HST is the 8:50 off Edinburgh, if you were interested.
Hope this helps, but please don't take the diagrams as a given fact, and I'm willing to be corrected by anyone with more info
