Find the King’s Cross milestone

People rushing to catch trains at King’s Cross are often oblivious of what they are standing next to, and right by a pedestrian crossing is an old milestone.It’s exceptionally easy to overlook in the hustle of city life, being very badly weather (or pollution) worn, and barely readable.
There seems to be an air of slight mystery about it though — as unlike many mile stones, it’s not that well recorded. It might not even be in its original location. But clearly someone som