How have the immigration queues in T4 been lately? I'm on the earlier of the two DTW-LHR flight later this week (getting in around 7:30AM) so I expect it to be busy, but with all of the controversy with the UKBA and wait times lately, I want to know what to expect.

Of course the flight is currently sitting at Y4 so maybe I'll get my first visit from the elusive op-up fairy, negating any concerns since I'd be guaranteed Fast Track.