Postcodes

Hello again,
This is the final jigsaw piece (i hope) to my events website.
I have a postcode sql that i want to intergrate into my site. this is it:
http://www.pjenkins.co.uk/blog/index.php/2007/04/04/uk_post_code_distance_calculation/
and here for php
http://www.sloomedia.com/php_postcode_script.php
I intend to have the menu page to search for events and catagories and with a distance choice too.
Has anyone done this before or know what im talking about, im losing the will!
Many thabnks for any help you can give me!