Again, I want to go through flight connections after landing and have a meeting for an hour with colleagues who are on a different flight. Specifically, for me, I will land at LHR at 630AM from JFK on a BA flight and then my BA flight to TLV departs T5 at 10:30PM so I actually have much more time.

Again, I hold a US passport and have never had issues entering UK before. I am asking how easy/feasible it is to have my meeting with colleagues in one of the T5 BA lounges (all of us have access) then leave from T5 and take the HEX into the city before returning to LHR. What are the specifics of getting an escort? Other threads mention taking a train to a different part of T5? Can someone explain the process to me.

Not that it matters but all flights are CW and I am OWE so I would have fast track. It is not possible to meet with colleagues landside because they are haeding off to a project on a different flight and we will only have an hour to meet up. Thanks! Z