Arrange for some booze
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Favours can be arranged if you can get some wine smuggled into the prison. A great deal of wine as it happens: the dockers, especially, have quite a thirst.
Unlocked with 50 x Bottle of Greyfields 1879
A merry night in the prison
You arrange for the wine to be delivered, and you are promised various favours for it. The wine is consumed that evening, and the prison is a pretty merry place for a short time.