In 1949, the minute hand was slowed down by 4.5 minutes. This was caused by a flock of birds that rested on the hand. In 1962, the snow caused the clock to ring 10 minutes late. Mechanical problems stopped the clock in 1976 and twice in 1997. The bell has cracked a few times. This was the cause of a heavy hammer. The Clock Tower went out of order for three years.
In 1844, the Parliament decided they should have a clock tower beside it. It was never at risk of tipping over.