Spotted 4 NC going anti-clockwise around the M25 and then Northbound on M11 this afternoon, possibly Northampton Area from the flash of a door magnet that I got. A novice cross and wristbands implied that you may have been returning from a track day, Brands Hatch I’d guess.
I was in a red ND Roadster, you may have spotted a blue RD a bit further on.