How the neighbourhood writing is made
By walking the place, sitting in the traffic, asking the watchmen and the tanker drivers, and reading the agreements of tenancies we have handled. It is first-hand and it is partial. Nine neighbourhoods is a small enough number to know and a large enough number that we are not in all of them every week.
Where we give a figure it is what we saw or were told, rounded honestly. Where we are guessing we say so, and where we do not know we leave it out rather than filling the column.