The boot catch is adjustable as the bolts fix through elongated slots. Have a look at the lock and the catch - slacken off the bolts/screws (usually torx type if I remember) and see which part will move. Try to adjust so that a firm press engages the lock causing the boot lid to shut properly. This should sort the central locking problem. If you find that you can't open the boot, don't panic - you can get access via the back seat.
John, December 2007