Screenwriters understand character, narrative and the emotional arc underpinning every piece of video content. To create an engaging script that will sell an idea, you need more than just 'copy' from a writer, you need story structure, character development and accurate visualisation of every moment on screen.

On top of that, you need someone who understands the filming process, how things are shot, visual styles, camera angles, budget constraints, mise-en-scene and how all these things impact on the delivery of the story you want to tell.