Nor does the Virgin Galactic site suggest that it will. As I understand it they've never made any commitment to any activity in the UK.
I've not seen any explanation of how spaceplane launches and (perhaps more critically) recoveries from/to Prestwick would be accommodated into the ATC system given the number of transatlantic and domestic routes through the area.
And if the answer is that they wouldn't happen very often that must beg the question of how robust the business case is.