Guardian reports that Tony Blair's hopes of winning cabinet support for identity cards have been dealt a further blow after Alistair Darling, the transport secretary, submitted a five-page cabinet letter opposing their introduction. Mr Darling is the fourth cabinet member to challenge the home secretary David Blunkett's goal of introducing a bill in the Queen's speech.

He points out that passports and driving licences are already due to be upgraded using biometric technology. The Driver and Vehicle Licensing Agency is establishing links with the passport service database to enable electronic validation of identity information. Passports are due to include embedded biometric information from 2005.

According to those who have seen his letter, Mr Darling claims an ID card would only add value if citizens were required to carry it - something the government has ruled out.