The bells and clock of the Elizabeth Tower - better known as Big Ben are being stopped for major repairs.
The tower will be covered with scaffolding for up to 3 years.
See the details in this story from the BBC http://www.bbc.co.uk/news/uk-politics-36138203
I've hunted around since hearing of this for the first time on last night's news but I can't find anywhere what the starting day is.