Absolutely brilliant afternoon at Brands and the car felt fantastic! 

New 10x18 wheels with Kumho V70 tyres and the still fresh excellent EBC brakes.

The track was quiet and I ended up staying out for 35 mins. I did some very slow laps to manage temperatures but never lost brake performance, only the tyres got a bit hot. 

From this session it did: 
52.88
52.92
53.07

I was having so much fun I ran out of fuel at the end, you can hear it cut out at the end of the video 😂 (tank still showing half, nice one BMW!)

An earlier session saw a 52.9 as well. This is about half a second slower than AR-1 but these Kumho's were about half the price and don't make any noise on the road. The Kumho's are 265/35/18 v the AR-1 275/35/19 so maybe in the same sizes they'd be closer in lap time.

What a day that was 😎😎😎😎