Strange
I've been using the IRIS system at Heathrow for a few years now and never had a problem.
It works really well and there is a great satisfaction in getting off a red eye flight at six in the morning, seeing a massive queue at passport control and just breezing through the glass box of IRIS so I can then go and wait two hours for my bags.
I'm largely opposed to all of the ID schemes as proposed but do see the need for good security at airports and using technology to make the airport experience a bit more manageable. Clearly in Manchester they can't get it right.
Bozos