Ruby,
It is truly creepy, there is a tunnel between the crypt and what used to be Newgate prison (now the Old Bailey)
The Bellman would ring the bell outside the condemned prisoners cell and recite the following
"All you that in the condemned hold do lie
Prepare you, for tomorrow you shall die
Watch all and pray, the hour is drawing near
That you before the Almighty shall appear
Examine well yourself in time repent
That you may not to eternal flame be sent
And when St Sepulchre's bell tolls
The Lord have mercy on your souls"
Cheery stuff eh?
They were real barbarians in those days