Our shared hosting has php 7.4 and 8.0 installed and available to use.
We're currenlty in the process of completing updates to the Hosting ControlPnale so that the php version switcher reflects the versions available (currently only goes to PHP 7.3)
In the meantime, you can activate the PHP version of your choice by simply editing the Handler line in your sites .htaccess file (a file easily edited in the root fo your site files).
The control panel file editor is the easiest way to edit this file (locate, right click file, select edit)
Replace or edit the existing PHP Handler line with one of the following relevant lines as required:
e.g. Setting PHP 7.4
AddHandler application/x-httpd-php74 .php
e.g. Setting PHP 8
AddHandler application/x-httpd-php80 .php
Once edited, save your .htaccess file