Ok, back inside in the warm! Half fixed. Turned out the wipers didn't work because the main plug (with 3 wires) had the middle connector (+12v) pushed backwards into the housing, so it wasn't making contact with the connection on the wiper motor. Unplugged, pushed in further and now it connects, so the wipers work correctly, woo!
The washer doesn't work though
When you push the button to spray window juice, you can hear a click, like a relay / solenoid, but that's it. Nothing actually engages. I bought a new (refurbished) unit (can't seem to get them new) so will try that tomorrow. Too cold tonight.
Oh and yes they do make glass to blade fuse converters!! Will try and find a UK supplier, in the meantime:
https://www.opgi.com/chevelle/CH30265/
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