White B7 RS4 saloon yesterday in Central London

[MikeFish]

Spotted a white B7 RS4 saloon parked on Guilford St near the back of Russel Square yesterday just after 5pm.
It had the white grill surround but I'm pretty sure it wasn't the white special edition (I looked for white trims and don't think they were white but can't actually recall if they were black, alu or carbon. It had white and black leather on the buckets and yellow calipers. Very nice and certainly unusual.
It had a private plate M11 xxx or similar.