Someone who works in a bank might know the answer to this one.
Last night my husband tried to withdraw some money from a Clydesdale Bank machine but just as he put his card in the screen flashed acouple of times and then a message about it being out of order came up. He couldn't get his card out. A similar thing happened to me, about 4-5 years ago with a Lloyds machine and I was able to go into the branch concerned and they retrieved the card and gave it back to me. So, I told him that's what he should do but when he went there today they told him any cards swallowed by the machine are destroyed for security purposes! Then he went to our own bank (RBS) to order a new card and was told there, yes all the banks destroy swallowed cards now, it's a security thing.
So, was I just lucky or is this a new bank industry wide policy that has been introduced in the last 5 years?