Repaired the wiring to the driver's door window regulator.
It's been playing up for some time, but yesterday it failed completely. All the previous indications were that it was an intermittent break, now a full break in one of the wires inside the flexible rubber "tube grommet" between the A pillar and the door.
I decided to splice two new wires in (if one has broken the other one can't be far off breaking too). The hardest and most fiddly bit was getting the new wires down through the tube. Once that was done it was just a case of cutting off the old wiring and joining the two new wires. Then putting all the trim back.