Got it and verified it: I can be seen from the outside. Loopbacks were the problem.

So it turned out that my server didn't support loopback and that once I worked out port forwarding I was on the web but that I couldn't see myself from inside the network.

I verified this by using a proxy server:

http://anonymouse.org/anonwww.html

which was sent to the external address given by Google to the query "what is my IP address".

I tried again with the web address that I had forwarded to the computer using an A record and it worked again where it hadn't worked before.  I'm live!