I have checked your site and the recommended permalinks /%postname%/ is still not yet setup as it still shows the url format of a page ignitebeauty.co.uk/?page_id=15 . When permalink is setup, it will display as ignitebeauty.co.uk/about for the About page.
It could be a server issue, if you have already tried activating the permalinks through the WP
admin and of which still does not work. You may try asking your host's support to activate mod rewrite on your server for the custom permalinks to work.