Hi All
Here is the update..
I spoke with lots of people who didnt seem to know. Including audi main dealers who still didnt know..
From cross referencing part numbers and chatting with Sachs found that there is a specific set of springs for cars with a tow bar fitted. Which seem to have heavier duty springs..
All ordered up including new lower spring mounts as suggested by Audi..
Got there in the end.
Cheers for all advice