I would point out that on a couple of occasions since she went back into service she has ended up at LGW due to ATC having to deal with longish delays for one reason or another at LHR. So its not all plain sailing.
On the ocassion I can remember the 21:15 service ended at LGW and the aircraft made a short positioning flight back to LHR - getting in just before the 23:00 ban.