Central locking problem

[Charles]

The latest problem: the central locking, which was working perfectly up to this morning, now refuses to work. I can still lock each door manually, but:

• lock button on key fob produces no result except a beep;
• unlock button works as normal;
• locking button on central console does nothing; and
• locking driver's door with key locks the driver's door but not the other doors, and does not set the alarm.

Any suggestions, chaps?