Well, now she drives straight and level thanks to her recycled truck tyre Panhard rod bushes, and the valve train is now silent again due to the application of actual motor oil, it's the turn of the brakes. Been fine up until yesterday morning when it took around two minutes for the warning light to go out and the ABS pump to stop. Same today. It's always been 15-20 seconds or so.
Guessing it's time for an accumulator then!