|Add this line to the hosts file, which is located at:|
127.0.0.1 www.ronuk.org ronuk.org
Save the file and give it a try.
You system first takes a look into the hosts file.
If there is such an entry, it uses this entry and the browser shows you website.
If this line is not present, your pc tries to find this website in the public internet.
Even if use DNS services like no-ip.com or DynDNS.org, it mostly will not work, to browse you internal website from within the same local network through the internet, back into your local network.
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!