Problem now soleved. The only controler for the central lcoking system on my car a 97 is in the drivers side door. It forms one of the electricaly operated door locks. I have fitted a new RH door lock, and a complete set of Jacar type locks for the other doors. Now every thing works OK. I don't what went wrong with the other locks but one of them was seized and the others just didn't work.

There is no controller in the foot well as I don't have an alarm system in my car nor is the central locking system keyless and there is no ABS - that's why I bought this model as there were hardly any electronics in it.

Thanks all for commnets and help.

Anyway job done and all fixed, excepting the rear door, which can wait for a while.