On a related issue
This question is more for the paying punters but is there anyone else who would like to join the Iris scheme but finds it impossible to get to the enrolment office while they're open?
I pass the airside office at T4 at least once a week (sometimes two or three times) but always before they open at 0730. If it was land-side I'd make the trip at the weekend but as things stand I can't so I often stand for up to forty minutes at immigration on arrival home (of course the Fast Track shuts at lunchtime). Usually I don't see anyone using the Iris recognition in that time. Contrast this with Schiphol where their machines often have queues at peak time.
I asked the guy at immigration about it once. Apparently they've rented the cheapest space they could get their hands on.