Possible Clues:

• Old prison mother will inevitably visit, do we hear?
• Awful shame, alas, about debtor finally imprisoned here!
• Former prison for debtors in Southwark, London
• Former London debtors' prison
• Mum arranged rash delivery of ales to old prison
• Old prison mother must visit, some say
• Order a lot of water for Old Nick?
• It kept prisoners of war, we're told, secure for the most part
• Senior officer sent to main prison
• Old prison mother will certainly visit, we're told