Brent Foulke’s has written a short article here discussing this question. I would add one significant point, particularly for those planting and wanting to plant in housing schemes: perseverance. This ministry is a slow burn and the fruit can grow awfully slowly. We are in a season of fruitfulness in Niddrie right now but for a couple of years we went through a time when we weren’t seeing anybody saved. I am sure we will go through dry times on the future but we just have to push on preaching the same gospel faithfully and trusting in God’s providence. That’s why people who have a real spirit of perseverance are necessary for this ministry.