FlyerTalk Forums - View Single Post - Arriving in T5 and using lounge in T3 during layover
Old Dec 10, 2022 | 9:34 am
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Airside is by bus, landside is Elizabeth Line (and other options) but that landside route definitely won't work since you won't have a T3 Boarding Pass. If you go via the airside bus you pass through security both at T3 and again at T5. Given the workforce shortages, it's not something I can recommend. Here is one of the many threads on this issue.

https://www.flyertalk.com/forum/brit...lounge-t3.html
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