Many years ago I was invited to the site of the original Talbot cars factory in Barlby Road, Kensington, London for a tour. When we went outside there was a small section of the original wooden cobbled test track that ran around the site and a small section had been dug up and a couple of bits of the old cobbles were in the spoil heap so I picked one up for a souvenir. Must be nearly forty years later I rediscovered it in a dark corner of my garage. It is about the size of half a brick with the worn cracked surface on what would have been the upper side.