OK, the parking light trick works: green indicator comes on dash, side-lights and tail-lights come on.
So it looks like it is I64... but which one is this?
In the fuse box there are 5x 20A relays (grey) and 1x 30A relay (yellow)
Then just next to the fuse box there are 3 more: 1x 20A (grey), 1x 30A (yellow) and 1x 50A (black)
And thats all the relays I can see under there. All the grey ones appear to work when I put them into the blower slot, and I don't know how I can test the yellow ones. I'm assuming its not the black one.
So it might be the socket itself? Or the wires attached? But which socket?
OH! ONE MORE THING
The blinking red alarm light to the left of the dash has one of the wires detached!! Don't know if this could be on the same circuit and thus be breaking the circuit?
So I guess I should re-attach this wire (its been soldered in the past, which isn't how a manufacturer would do it?....