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[ainarssems]

bit of a C5 trait to wear the tyres on the shoulders before the middle

You mean inside shoulder? Its not just C5 but pretty much all Audi models( and Passat) that share similar suspension setup experience this problem as suspension ages or if is lowered. If You mean both shoulders then it is because of too little tyre pressure or too wide tyres for the rim.

I am sure it is just inside on Amars car because:
1. If it were both shoulders he would have shown both in picture
2. If it was that bad on outside as well he surely would have noticed that earlier.