Welcome Sam,
Indeed, servers are Fully Managed and are monitored round the clock to ensure you excellent hosting environment and secure network. Our support team will look after all required Installation/Configuration & upgrades which are vital for server security.
You can refer to the following link for to check what comes under 'Server Management' services >>
https://www.webhosting.uk.com/linux-...management.php
Since you have been offered with root access to your server you can have all required setting (enable php mail, disable mod_security etc... ) you need to get in touch with our support team for such changes.