They probably do not even need the card now Sid, since the crap up "upgrade" where you can just wave your card at the terminal has been forced on us; it is now possible for them to just walk past you and skim the info they need with a scanner. Apparently there are covers you can get for the cards to prevent this. This was covered recently on BBC's consumer programme by Angela Rippon, unfortunately I did not get chance to watch it on catch up TV.