Code for keycode 4000RDS radio?

I need a keycode For 4000rds radio?

Hi I have a ford Mondeo W reg and battery recently ran out and now the radio is asking for a code!I don't no the serial number for the radio can anybody help so I can get it working again? Thank u in advance radio is keycode 4000RDS car I'd ford Mondeo X Wreg

Mark
March 2011