How do you add central locking to ford Ka?

I've got a standard model ford Ka, 02 Plate. If it's do-able I'd really like to add central locking/remote central locking to it cause I tend to forget to check the passenger doors and my passengers don't always think/remember to lock it.How do you add central locking to ford Ka?aftermarket auto/truck outlets sell and install them,and a kit that does the power windows cost little more,so i'd do both,would be found in local yellow pages in auto accessories or trailer hitches as the stores usually do both.

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