SagePay Form/Direct plugin turn off postcode validation in test mode
When using the SagePay Form/Direct plugin from WooCommerce in Test mode it should switch off postcode validation.
Reason: Sagepay test credit card data requires a three digit postcode to be entered in order to process a test transaction. This three digit postcode would fail UK postcode validation rules in WooCommerce thus preventing any testing of the process through the SagePay gateway
The postcode validation should then be turned back on when setting the SagePay plugin into live mode.