That sounds a bit mad to me... Dub and Belfast are only 1.5hrs drive apart or bus ride with aircoach. Why not LGW-DUB-wherever... That way you can have the A330 take the A320 LGW-DUB load if not full and pick up pax in DUB for onward travel subsequently... Just a suggested cost saver that would serve a larger population... I see Flyglobespan do similar via Belfast...