Hi Larry

Thanks for this. 

We now seem to have this working now as you've described. Once enrolled on the new certification the user is marked as being certified with an expiry date set 4 years from when the course was completed.

One thing to note was that to achieve this we had to remove the due date.

Normally we set a due date of 1 month in case someone is assigned the certification who has not previously completed the course in some other way.

When we did this we found that users with previous course completions had their records wiped , resulting in them having to retake the course.

To get round this we now assign the course via a programme initially and then assign a certification with the same course to pick up renewals.

Thanks 

Paul