The following were the correspondence regulations in Pentonville Model Prison, near London, in 1855:
Convicts are permitted to write one letter on reception, and another at the end of three months. They may also receive one letter (prepaid) every three months during their stay. Matters of private importance to a convict may be communicated at any time by letter (prepaid) to the Governor or Chaplain, who will inform the convict thereof, if expedient.
In the case of misconduct, the privilege of receiving or writing a letter may be forfeited for the time.
All letters of an improper or idle tendency, either to or from the convicts, or containing slang or other objectionable expressions, will be suppressed. The permission to write and receive letters is given to the convicts for the purpose of enabling them to keep up a connection with their respectable friends, and not that they may hear the news of the day.
All letters are read by the Governor or the Chaplain, and must be legibly written, and not crossed.^