A-ha! Thanks Hilary - I had the wrong form type selected. It's now working OK.
Can I ask, is there any way of automating the submissions when the tablet gets network connectivity, or do the forms still need to be submitted manually?
Finally, if the forms have to be submitted manually, is there a way of forcing the files to save with the date and time appended to the filenames (so that the end user can't simply overwrite an existing locally saved form)?
Thank you for your help so far :-)