As it stands, no extra flights to utilise said A330 have been announced or added.
The easiest extra usage of the aircraft could be MAN-MCO 2nd flight on Mondays, or, ATL 2nd daily on all 4 days of non use.
To use the aircraft at GLA would need a positioning sector, and, the flight time to MCO/LAS/BGI (any likely contender for extra flights) would not be able to fit in.
One way to get an extra flight in could be MAN-LAS-GLA-MAN-LAS but 2 issues with this plan are that I'm sure I had read that Virgin have confirmed GLA-LAS has been dropped, so the fact the 2nd route from GLA is already gone isn't exactly a good omen.