Rob
Hello from the UK too.
I think you may have 3 problems as I just solved the issues you had.
Firstly the file needs to be a .xml in the google base setup menu. Not .txt. If you make it a .txt then it will not be recognised and you will have loots of syntax errors reported.
Be careful if you rename a file to .xml from .txt I have had prob with it not 'really' being recognised as .xml ; so create it correctly first time.
I had issues with 'googlecheckout' errors ( my GCO is installed but not active - however GB feeder seems to want to include it anyway and it fails) so I did a search and replace for the GCO xml lines - quite simple.
finally even if you ask for the fine gooolebase.xml you may get products_gooblebase.xml. If you have registered google.xml as your feed, then the upload from zc will fail.
I still cannot get the upload to work from inside zc (the gco lines still have to be removed) but I did at last get a feed to work, and its better than doing it by hand !!!
Gary
Secondly the



