Nissan Micra 2003 Radio Code(default)?

Good afternoon, my other sweeter stupider half recently left the lights on all night, thus completley flattening the battery....

Upon recharging the Battery it is now asking me for my code! The problem is that i have never inserted one. I tried 0000 to no avail, and the problem now is that i must wait one hour in between all attempts... Any help would be most welcome