a leaked letter to other ministers written by david blunkett shows his strong support for a ID card to be compulsery for uk citizens
the card would possibly have fingerprints or iris prints on the card or something facial related to the cardholder
although you would not have to carry the card at all times if police officers request for you to do so you must provide the card within a few days of being asked to the card itself will cost around £40
http://news.bbc.co.uk/1/hi/uk_politics/3048386.stm