Great thread- love the T5 walkway- always good for some last minute exercise, especially if you've had a busy day and haven;t got your steps in before going to LHR.

That said, the other day I arrived at one of the remote-ish B gates in T2- I could have sowrn it took me around 15 minutes of jogging to get to passport control- absolute mission and I had a bead on. There's no shuttle either, so if you're not into running/hiking, it must be a hell of a mission.