If you spot a large town that needs to be renamed, post a request here and we'll pass it on to Support.
Smaller towns can might get bulk edited by an experienced editor.Tip:
You can use http://gazetteer.co.uk/
to find towns and duplicates
As a guideline, if the entire town fits within the screen at zoom level 3, then it can be renamed by ourselves. Any town larger than this is best done by support.
I'm expecting this process to be a slow, background task that we do while working on the daily task of fixing road names and routes. Some cities are in a worse state than others, and will want addressing first (ha ha). The list we give to support is only processed once a month, and the city polygons in the editor less often. Consider this to be a temporary trial, which we'll keep going for as long as it seems manageable.