How to capture coordinates of map extents in a QGIS print composer atlas?

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First question; be kind.

Here's what I have done so far:

• In QGIS 2.10.1 Pisa on Windows 10, I have a set of polygons overlaid onto Google Maps usingthe OpenLayers plugin in QGIS.
• Using print composer, I have created an atlas which enables me toshow and export each polygon along with the underlying map to a single .jpg or .pdf

So far so good.

Here's what I'm having trouble with:

• In print composer, it is possible to see the coordinates of the map extents for each of the atlas items. These are shown in the item properties area for the map I have added to the composition.
  
• I would like to be able to export the coordinates of the map extents, by either including them in a label on the map itself, or include it in a label on the composition itself.
  

I do not seem to be able to do this using the available expressions. Any help figuring this out would be superb.



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