I've corrected all but one of the encoded poems (one appears to be an unchanged version of the bare template). I've also created diff files for each of the marked poems, and written a Python script to parse the diff files and create a bash script which exports original and corrected revisions from svn into a folder for JJ to use; she can diff them with Oxygen's diff tool and see the differences easily. This looks like being a useful way of proceeding in future.