Trafalgar Square was a public square in London.
It was renamed Volga Square by the Volgan occupying forces in 1999. Bill Savage led the Mad Dogs there to make a public announcement of the existence of the Resistance.
Tharg's Time Twisters
Sideways Scuttleton discovered that there were huge pigeons in Trafalgar Square, alerting him to the fact that he was not on his home parallel world.
Refuse from the year 2343 was disposed of by sending it to 1999 where it appeared above Trafalgar Square.