R56 AUC Sensor
 

Hi all,

Its a minor issue but I am trying to locate the AUC sensor on my 2007 R56 Cooper. There are a couple of error codes on the ECU reporting it as faulty and the automatic air re-circulation definitely isn't working so I would like to replace it. The trouble is I can't find it anywhere and there seems to be literally nothing on the internet about it for Mini's.
Unless I'm being blind it isn't anywhere around the cabin filter compartment or cooling fan (the two places that seem to be common on other BMWs).

Any pointers on this would be greatly appreciated!
Cheers.