Originally Posted by
Globehopper
Unclear from the posts and rules is can you arrive T3 and use the BA Arrivals Lounge at T5 (assume that after the lounge, you leave the airport by ground transport)?
Or do they make you use the terminal in which you arrived?
This is an interesting question. I don't know if the new policy specifically addresses that. Perhaps someone can stop by the BA T5 Arrivals Lounge and ask

Though I don't know why one would purposefully trek all the way from T3 to T5 just to use BA's Arrivals Lounge unless you had a connection there or were meeting someone there...