I wanted to start a new thread with my own personal experiences of the dreaded clutch return issue and what might possibly be happening with my car and Audi.
I had the car into Audi in August for it's MOT, I also asked them to check out the return pipe while they were there as I have the issue when driving in a spirited manor that the pedal sometimes doesn't return properly, then pops back after about 1-2 seconds, usually when dropping down the gears and especially 3rd to 2nd.
They suggested more investigation was required and this would take their master tech 1-2 hours @ £110 per hour, this of course isn't a guarantee that he'd even find the problem.
So I sent Audi some comments via the .co.uk site explaining what had happened, what my issues were and that several people with the same problems have had this rectified by Audi replacing pipes / parts, usually as "good will".
Audi UK phoned Audi Huddersfield and they agreed to a free diagnosis in the form of their master tech taking the car for a drive with me as passenger, which I have just returned from.
He said the clutch return pipe sometimes blisters and if this is the case the clutch usually stays down / pops up ALL the time so he's not convinced that's my problem although the symptoms I described are 99% return pipe issue. He did say that as Audi would possibly replace the pipe as a good will gesture that he would recommend they did so and then if the problem goes we're laughing. If not it could be something else but it's a good start especially if it's going to be done for free.
I was also pleased that he said my car drives superb and he felt the suspension, gearbox etc all felt good

So fingers crossed, I should hear today / tomorrow what Audi have said and then hopefully in the next few days have the car booked in.
Watch this space.