And this is why I love FT. As much as one thinks they know, there's always more to learn. Although, with as many times as we've transited LHR, one would think I'd know about immigration options post-FCC, especially as I've likely done it in the past.
The e-passport stuff is relatively new, it seems. I was still thinking in terms of the "chip" and it seems simpler than that. In fact, coudla done this on our trip to London last week, but didn't even know. Fortunately, the Fast Track immigration at T5 had only 1 person in the line, so all was good.
Cheers.