Then contact WooCommerce support team and clarify the situation and settings you need to set to get correct shipping. We are able to help you in case issue appears with our theme only or in theme settings. Shipping is the default WooCommerce option, so, unfortunately, we are not responsible for it if it does not work the way you need even with the default theme.
At this moment if I use BN11 I get https://prnt.sc/12734lq
If I use BN11 5HU I get https://prnt.sc/127362g
And it displays the same way even with the Storefront, you can enable and check.
