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I've flown out of LHR twice, both as a rev pax when I was going to and from SVQ for studying abroad. On the way in, it was a BA->IB connection, and they just scanned the passport as I walked into the gate area. On the way home, I went through customs to leave the airport (missed my flight, had to go out the next day) but getting on a flight to ORD I think they just looked at my passport (maybe scanned, too?) between scanning the boarding pass to board and actually getting on the jetbridge. No questioning or stamps or anything.
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You are able to use your seat request to get all the way to the gates :-)
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Cool, that makes life much easier:cool: