Find the Blackwall tunnel plaque

If you were so minded to pass by and peer over the edge, you might notice that there’s an old plaque on the wall in the modern approach roads to the Blackwall Tunnel.It marks the opening of the original tunnel, which was marked by two great gatehouses at either end. The southern gatehouse still exists, but it’s northern counterpart was demolished in 1959 to make way for the highway that now rips though this part of East London.
While the gatehouse has gone, the plaque was kept in sto