It turns out it is part of the secondary fan circuit, just they understood the two fans were not replacable separately. They are saying that the compressor has gone - what a funking surprise there
I had issues back in 09 with it and asked if it was supposed to be sooooo bloody noisy and they said yes, so I left it at that point. 18 Months on and the secondary fan is completely dead and they are saying that due to this the condensor and compressor were not adequately cooled causing the compressor to knacker...it is also sending an intermittent signal to the compressor even when on Econ mode, but should be running 2% permanently to de-humidify apparently. So the price is on compressor and one secondary fan plus labour £1500 BUT they also have told me they are hearing an intermittent noise on the main engine fan as well, and as the labour is the same to do both it will be just the parts so £1800!!!
The manufacturer is stating they will offer nothing against their failed parts, so its over to VW Customer Service, which to the credit of the dealer they are putting a case together. The only good news is that the main fan hasnt failed yet so I can still use the car
So I will be adding an Air Con failure petition on this site
http://www.golfgtiforum.co.uk/index.php?topic=197968.0, as I have read loads about them failing.
Its a known issue and the first thing to check for if air con is not working, but they have not had enough complaints to make it a "repair for free/recall" type issue.