Well SLC actually, we were traveling down the A45 towards Northampton when I saw what I thought was an SLK, I caught it up and it turned out to be an SLC 43 AMG.
Unfortunately ahead we were all stopped by a very bad accident, mutiple fire engines, ambulances and police cars which had to squeeze past us as we all moved to the side to let them pass. Also the Air Ambulance arrived as well. Hope the people involved make full recoveries and there were no fatalities!!
I did get to give the driver of the SLC an SLKworld card, (unfortunate circumstances though). He turned out to be a Manager from the Mercedes-Benz dealer at Riverside, Northampton. He took the card and we had a chat, he also said he would get me a good deal when I go in to purchase my SLC 43 AMG. One day!