Leasing slots? expensive charges? For the coming winter season at least, isn't this all old world thinking? As I said earlier - LHR will be happy for this route to run until they get back up to near capacity.
I’m really struggling to see where the demand to London (LHR and LCY) from the MME area is all of a sudden, especially during the current climate.
Don't forget that LHR was a successful route for BMA for many years, and LBA-LHR has now disappeared. Might well be that it was the supply that was missing, and not the demand (for LHR at least!)