I've read that the Iris scanning is a failure and is being fazed out. As regards Fingerprints on that much vaunted Labour Govt sponsored programme UK Border Farce I saw a 2009 episode yesterday. It showed them raiding a scouse Indian Curry House and putting the suspects fingers in a portable scanner to see who they already knew either as an asylum seeker or someone (ie overstayers, illegals, failed asylum seekers, criminals) they foolishly let out on so called immigration bail.
I've emailed Mrs May asking for assurances that the inept public servants who "relaxed checks" and "exceeded their remit" will not be employed by UK Border Farce Mark 2