Hi Folks. Today I found my beloved allroad having a good weep through its headlight washers. Explains why I have been going through screen wash at an alarming rate! On inspection, the headlight washer nozzles are weeping permanently. I pulled the N/S headlight and disconnected the main feed pipe and blanked it off to fix the issue temporarily, but shouldn't there be a check valve somewhere in the system to stop the washers draining the reservoir? If so, I think this could be my issue. Any help greatly appreciated!