My fiance and I are arriving at Heathrow T3 on a Delta flight on a Tuesday (flight 402 from JFK). For anyone who has arrived at T3 on either this flight or at about the same time in recent weeks, how long have you had to wait to get through passport control? Just looking for an estimate as to how long it will take for us to get through....
It could be 30 minutes or an hour, it's really hard to say. It all depends on how many flights land around the same time as your flight.
Arriving on Flight 402: I've waited a mere 10-15 minutes. I've had to wait 2 hours. Unless you have access to fast track, you can only hope you're lucky and that you can get through quickly.