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Thanks alot! The reason for the pre-launch site would på to get up relevant content and start building SEO-value. Of course, there would be much more beneficial to also get some inbound links, however the resources for this is limited. Setting up a Wordpress-site is not much work and I have the content, but I am not sure if it is worth doing anyway?

You need to add hreflang tags: https://support.google.com/webmasters/answer/189077?hl=en Basically tell Google to index the .co.uk to Google.co.uk visitors and everyone else sees .com