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I've written a short python script for use in QGIS (currently using 2.8.1) to set the CRS for all loaded layers to OSGB 1936 / BNG. The script correctly sets the CRS but I have to manually scroll in/out to refresh the screen after running it - not a big issue though slightly annoying and possibly easy to fix!

I've tried using the code snippet below to refresh but I still have to manually scroll in/out.

qgis.utils.iface.mapCanvas().refresh()

Is there a line of code to force a full refresh/re-render of all loaded data?