I reckon that will have been the Blacklees (not sure they post here)on the way back from the Longcross sprint - a tortutous test track which is challenging enough in the dry .. and it was anything but dry today!
This Chim had PistonHeads - Speed Matters stickers down the sides and a big arrow and "door release under the mirrors" signs. Apparently the tow-driver had a PH t-shirt too according to the wife.
I knew my decision to go up the A1 instead, knowing that the M1 would be horrific, was worth it. Then you could have spotted another trailered, bestickered, blue Chim on it's way back from the Longcross sprint!