I have an intermittent battery drain on my Audi TT anyone know what this could be??

Welcome to the Audi Owners Club !

Good to have you onboard.

Hello Trace, 

That question is impossible to answer, since it could be as a result of a parasitic drain in any one of the electrical circuits. Knowing how long it takes to run your battery down would give a guide to the degree of parasitic drain. 
Before we suggest any course of action:- 

Do you have an electrical multimeter, and are you competent with using it? 
If the answer to those is yes, what is the maximum current the meter will handle? 
Perhaps you could come back to us with some more detail Trace. 

Kind regards,

Gareth.

p.s. Would you do us a kindness and complete your profile please.