So I'm a resident in Belfast, Northern Ireland and will be travelling home for the holidays as many of you are. However I'll be taking the train to Dublin, flying to the States, then returning via the same route. My question is this: I'll be going through customs in the Republic of Ireland, but what should I do once I'm back in the United Kingdom? Should I present myself to immigration control so that they know that I'm back in the country? Obviously I'll explain myself to the folks at Dublin Airport, but since it's technically a different country, will I have to prove I'm leaving again?? I have a residence card, so it wouldn't be as if I were trying to get around the UKBA, it's just easier and cheaper for me to fly this route. Any advice, particularly from anyone who's done this before, would be greatly appreciated!!!