Sounds like lack of fluid .... the headlight washers are fed from the LHS reservoir and although the reservoirs are connected, the headlight washers will fail before the windscreen washers ... in a way it's good because you get an early indication of low fluid ....... so to check for a fault, fill to brim, start the car, turn the lights on dipped beam and pull washer stick towards you for screen wash and flick wipe and, hopefully, a headlight wash....... oh and do it when the thermometer has been above freezing for a while
That'll be £15.50 + VAT then please sir