Considering the SRA did not exist at the time the Voyagers were ordered they would not have been involved at all. The Voyagers were ordered by Virgin although why OPRAF approved the plan back then is another issue. The TOCs were allowed more freedom back then.
My apologies (though in my defence I was only a year out). Either way VXC did not act alone in procuring those trains and it does not change the fact that that government involvement in train procurment has almost certainly contributed to the stagnation that we've seen in rolling stock.

