

The hammer on one of the four smaller bells surrounding Big Ben (R), which will be removed and cleaned during renovation work on the Elizabeth Tower, is seen at the Palace of Westminster, London, Britain August 17, 2017. Photograph taken on August 17, 2017. REUTERS/Victoria Jones/Pool


The 'Big Ben' bell chimes for the last time in four years ahead of restoration work on the Elizabeth Tower, which houses the Great Clock and the 'Big Ben' bell, at the Houses of Parliament in London, Britain August 21, 2017. REUTERS/Peter Nicholls. Peter Nicholls - RTS1CMWI


The Big Ben bell, which will be removed and cleaned during renovation work on the Elizabeth Tower, is seen at the Palace of Westminster, London, Britain August 17, 2017. Photograph taken on August 17, 2017. REUTERS/Victoria Jones/Pool


People wave European Union flags in front of the Elizabeth Tower, which houses the Great Clock and the 'Big Ben' bell, at the Houses of Parliament in London, Britain August 21, 2017. REUTERS/Peter Nicholls


Scaffolding surrounds the base of the Queen Elizabeth Tower, which houses the Great Clock and the 'Big Ben' bell, at the Houses of Parliament in London, Britain August 20, 2017. REUTERS/Peter Nicholls


People use their phones to film as the 'Big Ben' bell chimes for the last time in four years ahead of restoration work on the Elizabeth Tower, which houses the Great Clock and the 'Big Ben' bell, at the Houses of Parliament in London, Britain August 21, 2017. REUTERS/Peter Nicholls


Part of the three-train clock, which drives the hands of Big Ben, is seen in the mechanism room, which will be dismantled and cleaned during the renovation work on the Elizabeth Tower at the Palace of Westminster, London, Britain August 17, 2017. Photograph taken on August 17, 2017. REUTERS/Victoria Jones/Pool


Part of the three-train clock, which drives the hands of Big Ben, is seen in the mechanism room, which will be dismantled and cleaned during the renovation work on the Elizabeth Tower at the Palace of Westminster, London, Britain August 17, 2017. Photograph taken on August 17, 2017. REUTERS/Victoria Jones/Pool


A pearly King stands in front of the Elizabeth Tower, which houses the Great Clock and the 'Big Ben' bell, at the Houses of Parliament in London, Britain August 21, 2017. REUTERS/Peter Nicholls


A statue of Boudica is seen near to the Queen Elizabeth Tower, which houses the Great Clock and the 'Big Ben' bell, at the Houses of Parliament in London, Britain, August 20, 2017. REUTERS/Peter Nicholls


Workers stand on scaffolding in front of the Queen Elizabeth Tower, which houses the Great Clock and the 'Big Ben' bell, at the Houses of Parliament in London, Britain August 21, 2017. REUTERS/Peter Nicholls


Tourists view the Elizabeth Tower, which houses the Great Clock and the 'Big Ben' bell, at the Houses of Parliament, in central London, Britain, August 16, 2017. REUTERS/Toby Melville


Scaffolding surrounds the base of the Queen Elizabeth Tower, which houses the Great Clock and the 'Big Ben' bell, at the Houses of Parliament in London, Britain, August 20, 2017. REUTERS/Peter Nicholls


The Sun newspaper drive a model of the 'Big Ben' on the back of a truck equipped with loudspeakers around parliament square in London, Britain, August 21, 2017. REUTERS/Peter Nicholls
Big Ben chimes for last time in four years
The 'Big Ben' bell chimes for the last time in four years ahead of restoration work on the Elizabeth Tower, which houses the Great Clock and the 'Big Ben' bell, at the Houses of Parliament in London, Britain.