Tish Jones observed that Southwark Cathedral had a beautiful clock tower, particularly when it was lit up. (TV: The Lazarus Experiment)
According to the Tenth Doctor, the clock tower of Big Ben was known simply as the "Clock Tower". (COMIC: The Aquarius Condition) In March 2006, the clock tower was destroyed when the Slitheen craft crashed into it. (TV: World War Three) Reconstruction work lasted to as late as December that year (TV: The Christmas Invasion) It was also known as St Stephen's Tower. (PROSE: Lucy Wilson)
A Clock Tower resided in the town of Christmas on the planet Trenzalore. (TV: The Time of the Doctor)
St Luke's University had a clock tower, though in some dimensions, it had never been built. (AUDIO: Dead Media)
On Gallifrey, the Oldharbour Clock was located on a tower in the Old Harbour. (PROSE: The Infinity Doctors [+]Lance Parkin, BBC Books (1998).)