Brick walls are certainly a common sight in London, and you’d be forgiven for walking down Myddelton Passage without giving the one that runs along the side of the footpath a second glance. But if you take the time to look a little closer, the wall holds a peculiar relic. A series of numbers, letters, and dates have been carved into the brickwork, but they weren’t put there by any old vandal. These marks make up a unique historical record, first scratched into the wall over a century ago. While…