Gareth,
I totally understand your points and your suggestion that being able to do this is not in everyones skill set. My intention in posting this is to give helpful examples of how to construct an argument and what points to focus on.
To be clear - I am not trained lawyer - my study of the law has been through owning my own businesses and not being able to always afford a lawyer. I hope others can see from my post that it's possible to make Audi do the right thing by approaching it in the right way. If anyone is unsure or lacking confidence in doing that then I think investing in a lawyer to draft a robust initial argument is the right way to go with this.
Very best,
Martin