Car is 18 months old and has just breached 10,000 miles. The shoulders either side of rear seats have become detached from their holding clips. I've slammed them back into place but there is still a gap - enough to take in a thinnish paperback. Anyone else had this problem? Is there a diy solution or is it back to dealer for fixing under warranty - assuming this would be a warranty job.

It is still under waranty so take it back and get it fixed properly.