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Connecting thru London-Heathrow

I'm flying from Seattle to Warsaw with a connection in London (Heathrow). We arrive at Terminal 5 and depart at Terminal 3. With a 90 minute layover, I'm concerned about getting from terminal to terminal, as well as the time spent with Customs. Has anybody done this? Any tips?

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Yes, we have done this. You simply follow the purple "Flight Connections" sign directing you toward T3. They will lead to to a bus for the transfer from T5 to T3. You will stay "airside" and you do not go through immigration or customs.

http://www.britishairways.com/en-us/information/airport-information/london-heathrow-airport/lhr-connections

I timed it from the time we exited the plane, and it took us 35 minutes from gate to gate.

This is assuming you have carry-on luggage only, or baggage that is checked through to Warsaw.