Thanks for the ideas so far.
Yeah, checked the tyres and they are all the same size/correctly inflated and evenly worn. Steering wheel is a minute bit off centre (possibly one or two degrees), but i've re-zero'd the steering angle sensor in the dead-ahead and in the "as-it-drives" position with no difference to the fault.
I'm going to scope the wheel speed sensors tomorrow just in case one (or more) are doing something strange or too fast for Autologic to display on live data........
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