Sorry probably dumb question but just had a mono basin tap with ceramic valves fitted (single spout - two knobs type). Both knobs turn anti-clockwise to turn water on - which of course means that the left knobs turns forward and the right tap backward and that can't be right (certainly my kitchen tap handles both turn forward). Are there left hand and right hand valves (and the manufacturer has therefore fitted two left hand valves) or is there something that can be adjusted in the valve to change direction of on/off?