Hi Tom, thank you for reply.
The JA Mitius Kunena Theme is a custom item in the Jomlart quickstart pacakge, but as it only works for Joomla 2.5 and I am in 3.1.1 no component is installed and auto uninstall is not available.
I went through the site admin to remove manually any menus/modules/plugins that I believed were part of Kunena and the Kunena data tables in the database are all that is left to go.
I don’t know what was in the custom Kunena item in the quickstart package and just wanted to make sure it was ok to remove the data tables and double check what modules/plugins would have been installed to make sure I removed everything.
It is not causing a problem with the site, the sample data tables are just taking up space.