Gave a red 370Z a wave on my way to Surrey, got a wave back too.
I was going clockwise, he was going anti and was stuck in slow moving traffic just ahead of the Dartford Tunnel.
And on the way back, I passed a Kuro 350Z going the same direction on the M25, looked and smiled and then stuck behind me for a fair bit, and occasional lead changes.
Kuro continued onto the M23 while I stayed on the M25.