OK, rough costs as follows:
New clutch approx £150 GSF
New uprated clutch approx £500 +
New dual mass flywheel approx £270 GSF / £450 Audi
Fitting - anywhere between 5 and 8 hours, depending upon garage and whether they drop the rear drivetrain or not.
Single mass flywheel & clutch kit start around the £800 mark. SPEC from the USA are being marketed by a couple of companies as the exchange rate makes them relatively cheap. Again, similar amounts of labour.
Also worth replacing the clutch master cylinder at the same time whilst everything is in bits, and you will also need to pay for a 4 wheel alignment once it is put back together as the front subframe will have been dropped (and the rear might have been as well depending who fits the clutch).
I started a similar post a few days to which no-one replied. Basically I have an uprated clutch and a worn flywheel. I've had conflicting advice from two well respected VAG specialists - one garage said just replace the flywheel with another dual mass; the other said replace the whole thing with a single mass flywheel and a new clutch.