Many thanks Conor for taking the time to address my issue with the Google Checkout. Although I still have a couple of minor issues still to resolve, the respective servers are now talking to one another.

P.S. I agree with your comments regarding the checkout module, although I find it strange that only one version was ever written back in 2007 and never updated since. There could be a good earner there for a good software writer.

Thanks again Conor.