If you google "Big Ben" the images are all of the clock tower. This is news to me!
It is understandable since even locals will call it big ben, however the following link has more info
The Clock Tower is the name of the famous tower of Parliament - more popularly known as Big Ben. UK residents can arrange a tour through their local MP. Overseas visitors cannot
currently visit the tower.
Isn't that Big Ben?
Yes. Although often referred to as Big Ben, this is actually the nickname of the bell housed within the Clock Tower - and Big Ben's official name is the Great Bell.