Quite some time later, I've finally got my hands on a tool and some time and run it, with the following results (image below)
Which initially suggest ABS. At the same time I was running the diagnostic, the car did turn on the ABS light *and* the Stability light *and* the "slippery road" light. And then off again And then a while later on again. Repeat. Every time a small click from the car.
Although a bit off Googling gives me a youtube link that suggests Camshaft Position Sensor Circuit Malfunction) C1130 will also cause an ABS light fault, even if the ABS is actually OK.
Any experience/advice welcome.