electrical
So I'e checked the continuity of the fuses under the bonnet and pulled the instrumentation fuses in the passenger footwell and they're fine. I've disconnected the battery and left it for an hour or so in case it all went back to normal of its own accord but no such luck. I don't know why an earth connection being remade should spark - capacitor discharging maybe? All the wires were connected to the earth terminal before (however tentatively) so that probably rules out a dead short
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