I have a card which is kept in my wallet and it makes passing through airports much easier and less time consuming than always having to carry and produce a passport
So the difference in time to put your hand into your inside jacket pocket and remove a wallet and remove a card is how much shorter than putting your hand inside your jacket pocket removing a passport and opening it is ??
The issue of cost is neither here nor there. 7, 9, 15, 25 or 50 pounds !
What the issue is, is the collation and storage and use of private and personal data on the individual by government and that the personal and that the private and personal information is removed from the control of the individual.