Thanks for the replies DMcCoy,
Yeah I don't 'think' that works for the "History of changes" report as it doesn't appear to be a standard report (You can't open it in report designer). Happy to be told otherwise!
If not does anyone know of any other mechanisum to get hold of that data?
If you can use CommandReporter to run it does anyone know what the report name would be (I've tried 'History of Changes')?
By the way you can get CommandReporter to output xml by giving an output file with an xml extension. The xml file can be made to contain the schema of the report if set to do so in the report definition.