The London landmark whose clock bells are broadcast at midnight on New Year's Eve is Big Ben.
Big Ben is the nickname for the Great Bell of the clock at the north end of the Palace of Westminster. Technically, Elizabeth Tower is the tower, while the bell itself is Big Ben. The clock became operational in 1859, and its hourly chimes have become strongly associated with British public life.
On New Year's Eve, television and radio coverage commonly carries the clock’s midnight chimes as the United Kingdom enters the new year. The sound is produced by the quarter bells and the larger hour bell, whose tone is widely recognized internationally.
Big Ben has undergone major conservation work, including a long restoration that began in 2017. During restoration, the bells were largely silenced, though important occasions and testing still permitted selected chimes.