Hi Ernest,
It just does not come up with anything if the post code entered is not in the available list.
The test site is hosted on a multi-site C-panel so i will need to arrange a temporary ftp account with the site owner.
I however think the issue will be within the context of the WordPress administration i.e. the plugin and how i have set it up. If its working for you, it may be the configuration i have used. Do you want to have a look at that? The log in details provided earlier is still functional.
thanks
Femi