The new Netflix film “Rogue Agent” was partially filmed at Trinity Buoy Wharf in London, and features a scene in the Lighthouse where the main character explains what Longplayer is.
Watch here: https://www.netflix.com/gb/title/81607404
The Longplayer scene starts approximately 24 minutes in; there is a further visit to Longplayer towards the end of the film.
Below: James Norton and Gemma Arterton, from “Rogue Agent”