There is a post on here somewhere with all the colours listed. From my 1999 launch brochure, you also have:
Casablanca White W3
Mineral Grey metallic Z8
Azure Blue pearl effect 5J
Cornflower Blue F9
Ochre metallic (yellow/gold) Q3
Hibiscus Red pearl effect (deep red/purple) 7H
Mocha Brown pearl effect (yep, it's brown!) K3
Cactus Green pearl effect E7
Plus you could also order in Audi Lifestyle colours so any colour you wanted if you were prepared to wait and pay for it.
Never seen/heard of a genuine White, Ochre, Hibiscus, Mocha or Catcus UK car.