Didn't know about that one Kev. Might have to have a word with Jaime at Newent and get mine done.
I had the climate upgrade done which improved the system but I find it pretty annoying sometimes when the fans won't turn down manually.
I just came across it when playing with a tech 2. It's called something vague like "Auto fan program Enable / Disable". I think it appeared after upgrading to the latest climate firmware.
The effect I have noticed is:
If you just press auto, leave everything on automatic the fan behaves as before, i.e. if you select a temperature much colder / hotter than the current temp. the fan speed increases, and as the car reaches the selected temperature the fan slows.
If you manually set the fan speed using the 2 buttons to the left of the climate panel the speed you set persists until you press Auto again. In other words you can change the temperature and air movement settings as much as you like but if you've turned the fan speed right down it will stay where you've set it.
In contrast, the way it was before, you could manually turn the fan speed down, but change anything else and the fan speed would revert to the automatic setting, which I found very irritating.
I can't stand the fan being high unless I'm
very cold / hot so I just set it to its' minimum speed now and that's where it stays.
A conventional 3 dial heater would be even better IMHO.

Kevin