A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
It sounds like the sheets were already protected with a password when you opened the workbook and the macro executed -- but the password isn't "JLR". If this is the case, you need to provide the existing password so excel knows setting the userinterfaceonly property is "approved".
Beyond that, I am not sure what I can tell you.
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Regards,
Tom Ogilvy