Shaded maps can emphasise large areas much more than small ones - for example highlighting rural areas over urban, if fixed population areas such as Super Output Areas are shown. Consider providing an alternate mode in which values are represented by circles, or values are scaled by the area size (ie showing density).
How to create your own
Create your own: choropleth map
Chloropleth maps can be created in a range of desktop GIS applications such as MapInfo and ArcGIS.
Create your own: funnel plot
Funnel plots can be created in a range of standard data applications such as Excel There is help on creating funnel-plots in Excel.
