Hi again Kevin! 
The problem was in the "Pastoral" worksheet - it contained many links to pupil names contained in another copy of the workbook.
By deleting all of the rows (on that worksheet) OTHER THAN the row for Julia Bloggs, the problem disappears. The difficulty was that the line:
in the "PopulateLearnerReportSheet" was trying to find the row that contained the name Bloggs, Julia on the "Pastoral" worksheet, but couldn't - hence the error message.
The attached version of your workbook seems to work correctly.
Hope this helps - as always, please let me know how you get on.
Best regards,
Greg M
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