These are some concept works from Fable 2 and Fable 3. Fable 2 is set only 50 years after the events of Fable 2 so the designs for the buildings are similar in style.
They have the same feel to them, the designs vary from town to town in the games, but they still keep the same feel.
Even in Fable there are slums and poverty in the streets, remeniscent of old london streets. Stone bridges over a river, with shacks under the bridge for protection. Rats on the streets. It shows a poor and dirty life.
There were no sewers for a long time in London, people would through their waste into the river Thames. So we will need to incorperate a river into our scene.