Ok, I am at the last hurdle now. Electrical gremlins are here, probably something really simple but if u know, you can save time:
Headlights work with ignition off, but not when on.
Washer spray not working.
LCD not showing number.
Buzzer goes off even with ignition on warning of lights left on.
Fuses all fine.
I have removed the plug from the interior lights as I wanted to check them. Could that cause it? Don't see how.
Is this a known symptom for something specific blown or shorting out please?