Ever wondered if Cheapside really is cheap, what you do in Threadneedle Street, or who the knights of Knightsbridge were? Did you know that Piccadilly is actually an insult? And that Euston Road was built because there were too many cows on Oxford Street? Or that the River Fleet was covered over partly because of a drunken butcher? Take a trip down narrow lanes, through cobbled streets and crowded markets to discover the meanings...