WooCommerce is a hugely popular ecommerce platform with millions of users every day.
As a merchant, you need to make sure that the delivery details your customers enter are as accurate as possible.
The easiest way to do this is with the Address44 WordPress Postcode Lookup and Address Auto-Complete Plugin
Addres Auto-Complete is where the customer starts typing their address and then clicks the complete address from a list of matches. Postcode Lookup, is where the customer enters their postcode and then chooses from a list of addresses which match that Postcode.