Thanks Craig. I've created a new messages and this time I've completely deleted the placeholder in the subject line and replaced it with my wording. I've also changed all the other placeholders relating to the course name with my own message but left the first and last name place holders as they stand.
I am hoping that this will work correctly as I've included the actual link to the course where it's needed so users can click on this to take them to the correct part of the course.
Deborah