For inclusive web hosting, WebSite X5 uses the hosting partner Host.it, which unfortunately does not offer an org.uk domain, but the org.uk domain can be registered with a domain provider and then connected to the inclusive web hosting, see

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Web Domain- How set up a domain registered to another Registrar so it redirects to your webspace

In most cases, hosting and domain are bought together from the same provider. However, sometimes they can also be registered separately. For instance, you may want to activate the Webspace included in your license and connect it to a domain you already have on another provider.

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>> https://guide.websitex5.com/en/support/solutions/articles/44002248715

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