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Thread: Connecting T3-T5 at LHR and lounge access at T3
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Old Mar 18, 2023, 3:00 am
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orbitmic
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Have a look at these threads (there are several more):

Transiting in and out of Heathrow at T5 - but can I use a lounge in T3? - FlyerTalk Forums
T3 Access with T5 boarding pass - FlyerTalk Forums

Snap verdict: 1) yes you can access t3 lounges with a bp from t5, 2) but it creates a big mess for the reasons discussed in those threads, and is frankly not recommended given t5 lounges are fine.
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