Back in London. Mental note: the Heathrow “Fast Track” (reserved for business class and first class travelers) is not fast. I’ve yet to see anyone move through it faster than people get through the “normal” line.
The line for coach travelers is always four times as long, yet there are at least three or four times the number of immigration people checking passports. So… no matter how important it makes you feel, don’t take the Fast Track line!
(And Heathrow Express is great – 15 minutes to downtown London. Roundtrip is less than half of a one-way cab fare.)