OK, so, I think I can confidently say that it's an issue on my PC. Did two successful imports on my second PC running RW with files I created with Farling's tool - one using the containing article feature and one I did before that - both worked without issue.
So I think I need to nuke RW on my home PC, any ideas how to completely wipe it to start again?
Thanks for all the help guys and sorry for any concern caused Farling, it's a great tool and I'm loving using it
PS - Any good sources for CSV databases apart from pathfindercommunity.net?