All resolved. Used the roundabout way to fix it. Entered a coup,e of entries manual and then exported them. In my particular case the problem was the region. I had entered Surrey(UK country) but the manual entries showed Greater London. As soon as that was rectified, all entries imported without a hitch.
Previous problems included not creating the categories prior to upload and not having a valid user number in the user field.
Again, export an existing entry to get the right settings.
Hope this helps