So...I went outside to find this had happened overnight...!
Once cleaned off, I started taking things apart. Once the scuttle was removed, I could see the motor assembly. At this point I disconnected the plug and tested the circuit - no fuse was blowing which showed the problem was within the motor unit.
I removed the motor assembly and took it to my workshop. I drilled out the rivets and opened the gearbox.
Aha! My previous solder job had melted and repositioned itself under high current load whilst shifting heavy snow.
I got the soldering iron out and put it back where it should be. This is not ideal, but as the car is on its last legs, and I promise not to use the wipers in an aggressive fashion again, it should hopefully suffice.
Put cover back, rivet in place.
Reinstall, put everything back and test. I don't know if the movement comes across in this photo but it all works as it should do now.
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