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
It was used to import data to this forum - https://community.jthink.net