Hey, sorry for the delay in replying to this thread!
I have a resolution to the issue, after being flat refused by the dealership for them to do a swap under warranty, I went to Audi Customer services, they took it up with the dealership. After much too-ing and fro-ing, they finally conceded and did a full swap out FOC for a new trim in Piano Black.
Whilst I was having it done, a few of the tech's made some comments about they are having a lot of issues with this particular trim, one saying 'it would be better if they used butter!!!!' So it is clearly a known issue, now I've had it repaired I think this sets a precedent for others who have the same issue.
Good Luck
Mark