The Marking Report is a customisation of the standard Grader report but also contains a grade history report, based on the Ad-hoc Database Queries report from the Open University.

The code can be downloaded from github here:
https://github.com/iandavidwild/moodle-gradebook-marking-report

How To Install
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1) Download all files and copy them into a folder called 'marking' in your Moodle's './grade/report' folder.
2) Copy './images/audit.gif' to your theme's './pix/t' folder.
3) From the Settings block, select on Site administration->Notifications to complete the installation.