I'm sure I seem to recall that some VTWC guards or drivers operated the sleeper also, up until the point where ScotRail took over, then again I could be imagining that!I might be wrong, but I'm almost certain that they actually were part of the ICWC shadow franchise, and were operated by ScotRail as a subcontract of some sort. I don't know if Virgin Trains was ever responsible for them, though, or if it ended with the actual franchising.