Television production is increasingly making use of 3D models, in applications including animation and virtual production. These models are rendered to produce 2D images during the production process. However, with the ever increasing power of 3D graphics processors in home PCs, and new developments in 3D display technology, the time is right to consider how the broadcaster can maintain content in its 3D form all the way through the programme chain, This paper presents the results of PROMETHEUS, a UK 'LINK' project, whose aim is to examine the various issues related to developing an end-to-end 3D programme production chain using MPEG-4.