Not a single additional A320 has joined the EI fleet in that time
To date growth has been achieved through working existing airframes harder and finding efficiencies in the schedule. IAG undertook a review over a year ago and the result was a lot of very early starts and late finishes which has netted additional rotations on the existing short haul fleet. Hence they haven't needed any additional airframes for the past summer.
I read somewhere that BA are looking to improve yields by fitting an additional row of seats to their shorthaul aircraft and refitting rather than replacing airframes. Looks like capital is being invested in long haul across the group rather than in shorthaul unless a definitive business case exists.
Would have thought its a common sense approach within the group. Won't leep the spotters happy though looking for new registrations.