This is all explained in detail in the main story, and a bit of a shocker, but the few pics here describe another time pretty well...
https://spitalfieldslife.com/2018/05/25/the-hackney-whipping-post-x/
In the comments, 1962 was mentioned as the last time it was used, so all I can say is 'Hellfire'...
H/T Spitalfields Life
