The bench test showed up that the on/off switch is faulty, so everything is live as soon as a battery is plugged in.
The electronic control unit appears to work correctly.
The throttle servo is working ok.
The steering is not turning fully in one direction. I suspect this is because the steering servo was only being powered by my temporary 6 volt 4 AA battery pack instead of the 7.2 volt nimh battery that would be fitted for normal use

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