This morning I had a look at the different 'sub layers' available to me. Each map is built from a base layer (of which we have two, an OS map that shows streets, houses etc. as coloured polygons and a satellite map which shows cars, trees, phone boxes etc.). You can also add extra information on top of these such as plotting the location of libraries, one stop shops, bridges, bus stops and ward boundaries.
This is pretty useful because I now have a map of the borough with all the ward boundaries and the user can click inside one of the boundaries and see the stats for that ward. Now I need to figure out how to plot the geographic location of individual instances that occur in the ward which shouldn't be too difficult because the API has a method for doing that sort of thing.