Quick question to other R56 S owners, and obviously to the knowledgeable ones!

Parked my car up after a quick run across town from Uni today, and noticed that the engine was so loud, it sounded like it was still on. Now I know that when you turn off the engine, the fan stays on, but today it was really REALLY loud. I lifted the bonnet, and engine bay was not hot, and the turbo was touchable as I didn't get it above 2000RPM with the snow on the ground.

Could the loud fan be the fact that it was -1 air temp? Plus the car was due a service at the start of this month.