Originally Posted by
KARFA
what BertieBager noted was entirely correct, with an onward bp for a flight departing from t3 you can’t access the airside departures area in T5 where the ccr is - unless you have some significant manual intervention from ba.
what has been done sometimes is on arriving at T5 from another flight people will go to t3 to access to the lounges there before departing T5. Not something I would recommend due to timing and general faff tbh. T3 does not have ready to fly.
Hmmm, well I had no issue doing it in the reverse. I was able to go from T5 to T3 just to access lounges. I landed at T5 took a transfer bus to T3. When my boarding pass was checked at T3 they said make sure you give yourself enough time to get back to T5 and let me into T3.