Can anyone help my remote central locking on Espace isn't working I've changed the battery but still not working does anybody know where i can get a receiver box for it?

Its possible that the remote itself is just bad. or that maybe the car needs to be re-programmed with the remote. either way best place would be a Renault dealership. Another suggestion is to go to an audio / alarm installation shop as they have key-less entry and remote start systems they can install.