QuickCheck: Is it true that Big Ben is not the name of London's famous clock tower?

One of London's most iconic landmarks, the clock tower next to the UK's Houses of Parliament have long been referred to as "Big Ben". But is that actually what it's called?

WHEN it comes to visiting London’s historical landmarks, the iconic Big Ben clock tower will immediately spring to mind.

However, is it true that the name ‘Big Ben’ refers to the bell that hangs in the clock tower?