<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>https://www.domain.co.uk/</loc>
<lastmod>2017-06-16T16:24:20+00:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.5</priority>
</url><url>
<loc>https://www.domain.co.uk/about-us/</loc>
<lastmod>2017-05-26T16:55:16+00:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.5</priority>
</url><url>
etc etc...
This question has been answered by lkfranklin. See the first response.
It's completely normal but it is worth mentioning this is just a site map really to be used by SERPs and not users. You can follow the instructions here to submit your site map to Google https://support.google.com/webmasters/answer/183668?hl=en
For an actual sitemap page that sits on your front end for users to use you could use another extra or just wayfinder or pdotools