Originally Posted by
NA-Flyer
If you arrive in London flying in any premium cabin, you don't have to wait that long
Often the Fast Track lines take just as long, if not longer, than the main non-EU line. So arriving in a premium cabin does not always help.
But this is entirely dependent on the timing and the terminal - arriving first thing in the morning into T4 always seems to be a disaster, whereas I have also encountered zero lines at off-peak times in other terminals.