Gerard Darminin, French Home Secretary equivalent, has said that the UK is making itself a migrant target because we have no national officially issued ID card proving entitlement.
I, a very ordinary citizen, already have an NHS number issued at birth, and a National Insurance number sent to me at 16, neither of which has changed. I also have a passport number, due for renewal next year, a driver's license and a Government Gateway number for my occasional exchanges with officialdom.
Why would anyone who has nothing to hide from the authorities prefer not to hold an official proof of identity?