The Telegraph reports that the Conservatives yesterday joined civil rights groups in voicing opposition to the Government's proposals to introduce compulsory identity cards and criticised David Blunkett, the Home Secretary, for masking his true intentions behind "spin and obscurity".

Plans to announce the scheme in the Commons before Parliament rises today have been shelved - officially because of pressure on parliamentary time - but the Home Office said yesterday that the proposals for the ID card were "progressing well", with an announcement expected in the autumn.

Oliver Letwin, the shadow Home Secretary, said he remained "highly dubious" about any move towards a compulsory ID card.

The issue of an identity card is too important a one, with too far-ranging implications for our liberties, for the Home Secretary to resort to spin and obscurity.

Home Office estimates of the cost of the scheme range from £1.6 to £3.14 billion but Simon Davies, of Privacy International, says the true cost will be very much higher. Mr Davies led a campaign against an Australian ID card in the 1980s. Initially the plan was popular but opposition grew strongly when the scheme was finally unveiled and the government was forced to abandon it.

We know from industry estimates that a 'smart' card with biometric information such as the one proposed will cost well over £100 per head, so the final cost will be more like £5.5 billion.

This is a high risk political gamble for David Blunkett. He knows that popular opposition will mushroom once people understand the implications of the card, so he is being meticulous in concealing his ultimate ambitions.