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Do I have to go through Customs in London? Proper protocol?

Air Travel Forum - TripAdvisor - www.tripadvisor.com
I'm flying British Airways from the US to Vienna with a layover in London's Heathrow airport. Do I have to go through Customs or how does this work? I've never flown internationally before. Also, on my way back, I have a layover in Dublin. Do I go through customs and make the declarations if any once back in the US or when I leave Vienna? Thank you for your help.


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