There are many variations between different parts of Bolton. This page will help you explore these differences.
In general, the smaller the type of geographical area, the less information is avaiable about it. This is because from a practical point of view, more data points need to be collected overall to create reliable estimates for smaller areas. But within a larger area there may be significant and important variations which may be averaged out and hidden if you only look at the larger areas. The Geographies section of this website will help you understand the geographies at which information is typically available.