A bit late to reply to this, and my experience is with the wife's 2005 Micra, but 'rolling down the slope' caught my eye. Her battery was fully charged, everything worked but occasionally when the key was turned only a click was heard. If she rolled it down our sloping drive, not to bump start, just to jolt things a bit, it started. Since we moved to a place with a flat drive the problem hasn't recurred. They clearly don't like being parked on a slope.