I had this a couple of weeks ago during the freezing weather. I'd top up the reservoir but next day the light on the display would be on again.
Suspecting that the bottle had split due to no antifreeze in the scoosher liquid (Scottish, see) I started to strip out the o/s/f area to try and get the bottle out. Mission impossible btw, for me anyway.
Turned out the lines had frozen up and sort of jacked up the n/s/ headlamp washer by about half an inch (prefacelift) causing a leak.
Just had to press it back down (and rebuild the o/s/f engine bay area). Fixed.
