Originally Posted by
casey89
Really? How did you pass the turnstiles in T3 with T5 boarding pass? Also how did you get to T5 from T3 airside?
There is a thread on the BA forum about doing just this . You have to get the T5 transit train, then double back to transfers. You just tell security it's for a particular shop if they ask. They rarely do.The staff at the lounges will remind you you are departing T5 and should leave sufficient time. It can be a faff but I had many hours to kill.