The space will be repurposed by Gatwick Airport for another tennant, I don't think it will be mothballed in readiness for any return years from now as there's no return on the money being spent. As for Virgin, they have financing til the end of the year and then if key markets are not open in volume then they're back to refinancing again. A return to LGW would be a medium term "nice to have", survival with a LHR/MAN focus is all right now.