Today was the first time since only my Mini that the internal temperature was warm enough to warrant a bit of cooling.
I selected the aircon button however the temperature of the air never got cold. I tried Auto which as I understand is meant to automatically regulate the internal temperature based on external conditions however this didn't improve things.
If you wanted to cool your car down quick, set it on the MAX button. Generally, the air con in the mini is pretty good but you do need to turn the fan up for most effectiveness.