From memory LS added additional rotations at BFS for this summer. At a guess EI added to the list due to the LGW aircraft being freed up as they were already committed to the Belfast programme.
All I am saying is the EI legacy at Belfast doesn't seem good from an observers point of view. How many routes have they tried and withdrawn? LGW month on month always seemed to be on the decrease, their only success seems to be LHR.