Doesnt make sense. I would have thought their target would have been more pax to LHR than SNN had rather than a % of the market? Else why the move?
If I remember correctly EI self handled at SNN and it cost them fortunes as the only flights that were handled were the T/A and LHR flights.
Moving the flights from SNN to BFS probably saved a small fortune.
Even though they are carrying less pax they may well be making/saving more at the end of the day.