Install this plugin for UK address validation on WordPress Sites.
Sign up for a trial account that includes 30 free credits at www.postcodes4u.co.uk
Enter the username and the product key generated from the www.postcodes4u.co.uk site into the Plugin Options page within the WP Dashboard and have address validated data for your customers orders.
After the trial period (30 credits) has expired, it’s easy to purchase more credits from a range of competitively priced bundles to ensure your dispatches are going to a UK address that has been PAF validated.
See this plugin in action at :
Download our Postcodes4U WordPress Plugin HERE