“Cannot recommend this plugin highly enough. Very simple to use, and the cheapest postcode validation available in the UK for smaller volume users like me. The plugin installs very simply, and integrates with WooCommerce beautifully.
Their own website where you can set up and manage your account is fantastic for keeping tabs on all aspects of your usage, and is also simple to use. Their user support via chat channels is super responsive.
This should be bundled with WooCommerce for UK users. Nothing is simpler for postcode validation”