Ka central locking problem

[The Visitor]

Hi all,

My first post here - hope someone can help. My mother in law has a Ka and the central locking has packed up. Once locked you can't unlock it from the drivers door. The motor makes a whirring sound but nothing happens. If you try the passenger side the CL goes mad - whirring and clicking for ages but still it won't open. Only way in is through the rear hatch and pull the handle on the inside.

Any ideas?

Thanks.