corniche

I've just lost an original key for my Corniche III. Does any of you know where I can get a key blank that looks like the original one? I've attached an image of the version of the key I'm looking for. I've searched everywhere on the internet but can't find anything that looks the same.

Looking for some advice now my batteries have given up and need replacing. I have a dual battery system in the car which confuses me, and I want to install a smart battery conditioner, but the setup doesn't accommodate two batteries. Should I change to one battery or is there some kind of...