The hosting fee covers the ongoing costs associated with the running and maintenance of the website, the servers, the database, backups, the software licences, email services (where appropriate), and other miscellaneous costs associated with ensuring that the site and the email services are running 24 hours a day, 7 days a week.
There is also a small component related to continual development of the website and administration facilities, for example, upgrading the contact form on the website to include image verification (to prevent spam), enquiry management facilities in the CMS, and email auto responders (an automated email is sent to the person after they have filled in the contact form).
These regular upgrades are not separately charged but part of the hosting and maintenance services that Blackbox provide.
The domain name registrations are not included in the standard hosting fees, but are a small additional charge, usually paid annually or bi-annually.