I vaguely remember a similar scheme associated with booze consumption a while back that required people to give a thumb print in certain pubs.
As far as I know, that died a death. Rightly so as well, as if I had to give some ID in order to have a pint - that pub would lose my business instantly.
On the face of it (if you pardon the pun!), it seems like a vaguely good idea - BUT, if I was being cynical, I would say that our glorious leaders want to get everyone's details on to the system by whatever means possible. This is just another way to get a certain sector of society tagged.
Thats why decent people are getting fines and criminal records for daft things now (like leaving your wheelie bin open or out on the 'wrong day'). Instantly they are tagged, whereas before they would have stayed 'under the radar' for all their lives.
Maybe I'm being paranoid, but its a thought..