In this on demand digital age, we can stream Hollywood movies to our mobile phones and pre-order the DVD boxset of a television show before it has even aired. As Doctor Who approaches its 50th anniversary, the show is reaching ever-greater heights of popularity and international exposure. Amid all this, it somehow seems impossible to comprehend that there is a large swathe of the programme’s early episodes now lost to posterity.

Doctor Who’s ‘Destiny of the Doctor’ series reaches its fourth instalment with ‘Babblesphere’, a tale for Tom Baker’s Doctor and Lalla Ward’s Romana. Written by Jonathan Morris, the play is performed by Ward with Roger Parrott.

Arriving on the Earth colony of Hephastos, the time travellers come across a replica of the palace of Versailles encased in a geodesic dome and set amid a harsh volcanic landscape. Within, they find an artistic commune where the perils of social media are writ large.

This is pretty gruesome stuff in places and certainly the kind of broader territory that Doctor Who could only tackle in expanded media.