How to change the Spyder editor background to dark?

I've just updated Spyder to version 3.1 and I'm having trouble changing the colour scheme to dark. I've been able to change the Python and iPython console's to dark but the option to change the editor to dark is not where I would expect it to be. Could anybody tell me how to change the colour scheme of the Spyder 3.1 editor to dark?

Please go to

    Tools > Preferences > Syntax Coloring

and select there the dark theme you want to use.