Thanks both of you. I recently found a thread that you both contributed to that seems to describe my issue.
https://www.mobileread.com/forums/sh...26#post3752326
However, after installing the plug-in i'm left with the same issue. The suggestion of using the companion seems promising. Not completely sure what "probably front-end" means but i'll look into it.
The reader seems to not be refreshing on a re-send as in struggling with this issue, i just found that i can force Bookari to see the changes (good news) however, it requires me to delete the book and re-send it. This unfortunately also deletes any and all annotations associated with the file (bad news) i don't want to lose all the work put in with the annotations.
Heading over to calibre companion FAQ site now. Thanks again, Tom