Well, it was looking good...for about 15 minutes. Then they all started coming on again.
Also, a new symptom! My Aeroforce gauges have the steering angle displayed. It remained blank after starting for a while, until I turned the wheel for a tight corner in a carpark. And until it came on I was also getting the traction control kicking in as if I was spinning a wheel while moving off. In a dry underground carpark. Complete with power reduction.
It was also failing to display the instantaneous fuel consumption at that time, so I don't think it was the clockspring at fault, but will check for loose connections there today.
Charge voltage while driving was at 13.9-14.2V. After overnight 'rest' the battery is sitting on 12.3V this morning.