I'm connecting at LHR flying BA in and out of T5, and it looks like Priority Pass only has lounges in T1 and T3. Is it possible for me to access these lounges? It looks like the process is to exit T5, then re-clear security into T3 (will they even let me in if I'm flying from a different terminal?). Then I'll need to do the reverse when I leave the lounge to get to my gate. I do have lounge access through SkyTeam and *A, but they're not doing me much good on this BA flight. ETA: Alternatively is it possible to get a day pass or month-long membership through BA?