The official name of this tower is the Saint Stephen's Clock Tower. Because that's what it is: a clock tower. And the name Big Ben doesn't refer to the tower, but to the bell inside the clock tower! There are several theories as to where the name came from: it could be named after a very famous boxer at the time the tower was built; or perhaps it was the builder. And perhaps both those theories are wrong and it was just someone being funny, we will never know for sure!
Anyway, the bell inside the tower was the second bell installed. The first one fell and after that couldn't be used anymore: it had lost its tone. This one also fell, but it didn't loose its tone and was hung in the tower.
It's said that the clock is always correct, however there were two occasions when the clock was late: once New Year started late, because the snow had weighted down the hands on the clock and on a seperate occasion a bird had found a nice perch on one of the hands, making the clock late as well.
If you ever listen to the BBC world service you can hear the bell at the start of the news, bringing London home to wherever you live.
Says the Leaning Tower of Pisa to the Big Ben: "If you've got the time, I've got the inclination".
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