When I contact an Audi dealer they always tell me they are not authorised to sell VAG tools.
In case anyone (like me) is unaware, you can buy (if your wallet can stretch to it!) ANY VAG tool form the following:

BrianBell
Inventory Support Administrator
tools.equipment@vwg.co.uk
Fax: 01908 601142

Just e-mail Brian with your request, and he will provide a quote.
To find parts, use the Erwin website, www.erwin.volkswagen.de, to view the tools catalogue.