Graham has very kindly reviewed the code and "tidied" things up, but this is still throwing up the same error on the same line as in my original post.

Annoyingly, it works fine on my "home" Office 2019 set-up, but refuses to play ball on the "work" Office 2016 set-up.

I found this link here https://social.msdn.microsoft.com/Fo...forum=exceldev, which mentions Outlook Security Guard (?), but again still no joy.

I'd really appreciate someone who could make a suggestion to be able to get this working.

Thanks!
Steve