Source: United Kingdom UK Parliament (video statements)
At 2am tomorrow morning, all the UK’s clocks will go back. This includes the clock in the Elizabeth Tower. 🕰️
Our clock mechanics will be testing the mechanism. They will lower the clock’s weights to stop it running and perform maintenance. 🔧
This means that from 6pm on Saturday, the hands will not be showing the correct time until 2am on Sunday. 🔕
Watch Big Ben’s bongs in 4K: https://youtu.be/KnAjjR9HJXU