ianrichardson wrote:

I turned the DSC off and not a trace of ABS motor on any corner, fast or slow.
So from that I deduce that there isn't a massive problem and that the 'wear' on all the suspension bits front and rear is making it very sloppy.

This is exactly what you would also expect to see if the steering angle sensor needs calibrating - that's why I suggested turning off the DSC in the first place

As you say, it sounds like you need to do work on the suspension anyway, but I have a feeling that you'd rather pay 20 quid to fix the calibration and "possibly" solve the problem than 500-1000 quid to replace half of the suspension.

I still don't see 100% how worn bushes could cause serious interference with the DSC system to the level that you're seeing.

To fire the DSC several things need to be detected using data from, amongst others, the wheel speed sensors, steering angle and yaw sensor. Obviously worn bushes would mean play in the suspension and steering, but that wouldn't necessarily causes deviations from what would be expected...unless there was a serious amount of play in the track-rod ends, but this would make the car almost undriveable anyway and you didn't specifically mention loose steering.

The steering angle is measured at the column - not at the wheels and although this could mean that you have to turn the wheel more than expected to turn the D3, I'm not sure the difference would be enough the trigger the DSC.

Just thinking out loud....

Cheers,
Paul