Having looked at the front struts during the brake rebuild I have come to the conclusion that the superrstrut system is also throwing variable caster into the mix as well as the constant camber thing
Unless this is how it achieves the constant camber while turning the wheel
You can clearly see that the hub moves backwards and forwards as the steering is turned
Given that the strut top is fixed I can only possibly see this tilting the steering angle and as far as I know that's changing the caster
The wierd thing is as you turn the wheel one side gets more catser the other gets less.....
You can see it in these pictures
In the top one you can see the strut is laying forward while the bottom one shows the strut vertical