First thanks to everyone has helped me migrate my old forum to Discourse.
As part of this I wrote my own Java import tool for importing .csv files into a new Discourse installation.
And I have now open sourced it, expect this is of most use to other Java developers moving relatively small forums to Discourse from another forum. In my case i was importing from JForum but the tool is not JForum specific it just works from .csv files.
Code can be freely modified as required
https://bitbucket.org/ijabz/discourse-transfer/src/master/Readme.md
It was used to import data to this forum - https://community.jthink.net