I got the electrician at work to have a quick look today. Somebody has been there previously with the electrical tape still intact. Removal revealed the obvious cut to the rubber boot and a red & yellow wires were crimped together but badly on both sides. To get better access I scalpled the cut a bit more on the left hand boot which showed a brown wire and 3 small white wires broken and another ready to go. All the wires were recrimped adding a bit of extra wire to cope with the opening/closing. All the lights now work but the wiper is still fubard, so fuse removed again UFN.