1949 Big Ben rang slow first time in 90 yrs
This was because of starling birds obstructing the minute hand which resulted in slowing the clock by 4 minutes. This Pathe film shows Big Ben a year later in 1950.
BIG BEN Lego model, Lego Store Leicester Square
https://www.lego.com/en-gb/stores/stores/uk/london-leicester-square