When we went into Llidles to shop we paid by card they asked for identity, we used our old corner cut off out of date residencia card, no problems.
when we changed to the new certificate we didnt have a copy of the old card, after going to the bank to pay for the certificate we had to get a copy of the old residencia card, how daft is that.
Still. done now, and although totaly useless, her words!! it was quite painless.
                        Terry.