Thanks Jo and Mike!
I have just done a search on eBay, and *lo and behold!* they are all there - I must have just been too impatient, wanting them to be there straight away!!
Having said that, Auctiva says they are all listed successfully, but I do get "notice" messages in the orange link, that say:
API Warning
Insurance option has been turned off since it is not available.
Do I need to worry about this, or can I just delete these messages??
Thanks again for your help and I'm really looking forward to creating and posting more listings!!