London’s New Year’s Eve celebration prominently features Big Ben as midnight approaches.
Big Ben is the nickname commonly used for the great bell inside the Elizabeth Tower at the Palace of Westminster. Although the name technically refers to the bell rather than the whole tower, everyday usage often applies it to the clock tower landmark. Its chimes are a familiar part of the United Kingdom’s midnight broadcast.
London’s modern public celebration developed into a major event around the River Thames. Fireworks are launched near the London Eye and along the waterfront, while spectators gather on bridges and embankments. The celebration is timed to Greenwich Mean Time’s successor, Coordinated Universal Time’s United Kingdom local implementation during winter: Greenwich Mean Time.
The London Eye is an important fireworks location, but it is not the clock whose chimes traditionally mark midnight. That distinction explains why Big Ben is the canonical answer to this question.