Originally Posted by
phlwookie
Just to confirm other replies, this morning someone ahead of me at Fast Track security in LHR T5 was denied because their boarding pass was out of another terminal. They asked to be let through to use a T5 lounge, but the employee told them to access lounges in their departure terminal. I can't imagine it'd be any different for T3 with a T5 boarding pass.
Yes, thank you for the confirmation. This is what I love about FlyerTalk. The ability to ask rather obscure questions and have such detailed and accurate answers with personal experience to back it up! :-)