Hi guys, new to the forum, my F30 320i is 3 Months old now, and I heard similar noises on my very first trip. At that stage the car had only 500km's on.
It sounds exactly like a steering rack issue, and there's an easy way to replicate the noise with the car at a complete standstill.
Ignition on (car off) turn the wheel left and right in rather quick succession and you can hear the clunk.
I also found this:
And this guy is exactly hitting the rack end, and not very hard...
I've considered taking it in, but as muck as I trust BMW, I don't particularly like the idea of them taking apart my suspension / steering rack... Maybe I'm just "over protective" of my car.
And yes, the Australian cars are built in South Africa...