You would lift the car with your trolley jack on a load bearing member as the sills aren't actually load bearing. wink
No sh1t Sherlock, that's the question I'm asking as there is no suitable, obvious load bearing member to see, rather than do damage

Thanks mac7, that's got to be an essential purchase for me. So I'm going to get the following:
8P0 802 845 x1
8P0 802 846 x1
8N0 804 583 x4
8P0 802 847 x2
It'll help loads when I come to change the winter wheels back, but also give me peace of mind the first time I have to let the tyre monkeys anywhere near it. I'ts off to the Audi garage for me!