The Home Office's plans for ID cards depend on the reliability of the biometrics chosen to identify people.
So do their plans to protect our borders.
If the biometrics chosen are not reliable, then these plans can't work.
The Home Office are advised on these matters by the Home Office Scientific Development Branch (HOSDB*). A correspondence with HOSDB got off to a good start, please see below, and then stopped. Not only were letters not replied to, they were not even acknowledged.