[Conquistador]

To update this, the fuses were all OK, as was the connection.

I stripped out the wheel arch liner and found the little black motor had some corrosion at one end and had seized, I also believe that's where the leak was coming from and how the tank emptied itself every now and again. Replaced with a new motor and it now works as it should. Also took the opportunity to clear out the little plastic mesh filter which was full of lovely Legionnaires' with some hot soapy water.

From what I remember when I had it apart, there is another motor for the headlamp washers, just a bit further up in the tank. I can't find a diagram for it on ETKA but does anybody know if it's an identical motor to the windscreen one? If so I'll order another and change that too for peace of mind.