Pugin ; at the time of Barry's visit him to collect the drawings: "I never worked so hard in my life for Mr Barry for tomorrow I render all the designs for finishing his bell tower & it is beautiful."
Strictly speaking, the name refers to only the great hour bell, but it is commonly associated with the whole clock tower (formally known as St. Stephen’s Tower)
...get the time off the largest four-faced chiming clock and the third-tallest free-standing clock tower in the world, which has been telling time since 1859.