Throughout the various stages of the lockdown regulations, people have been told to continue working (other than in businesses closed under the Regulations such as pubs, restaurants, some shops, etc) wherever possible. There has never been any reference to 'essential' in either the Regulations or the gudelines for most types of employment.
So, for example, (unless they could work from home) people doing non-essential jobs, such as making plastic novelties, were (and still are) expected to continue going to and from their place of work as long as they can remain 2 metres apart whilst there. It's no different for those who work in the media.