Piccadilly Circus and surrounding area. "Piccadilly Circus is a famous traffic intersection and public space of London's West End in the City of Westminster. Built in 1819 to connect Regent Street with the major shopping street of Piccadilly (the 'circus' refers to 'circular open space at a street junction'), it now links directly to the theatres on Shaftesbury Avenue as well as the Haymarket, Coventry Street (onwards to Leicester Square) and Glasshouse Street." - Wikipedia. More than a day trip from Thornbury Castle, and certainly worth the travel!