Originally Posted by
TyneTraveller
With 2.5hrs connection time, I would come out landside and reclear security using the fast track at south security. I'm not sure why you would need to use the first check in area at LHR though. Are you not planning on checking through to SEA at DUB airport? They should have all the necessary tags available there. If you are doing a B2B LHR-DUB-LHR-SEA you could try and use first check in before your first sector and get your bags sent to SEA without going up to DUB, but these sorts of things can always backfire, adding unwanted stress to the journey.
No b2b, we are having a few days in Dub before the main trip so will be taking luggage with us. Just wasn't sure if there was anything special about 1st class checkin that's all...